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Amateur Sleuths
British Detectives
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Crime Investigation
Crime Solving
Criminal Investigations
Detective Fiction
Detective Work
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FBI Investigations
Forensic Investigation
Forensic Psychology
Homicide Investigations
Intelligence Agencies
Intelligence Gathering
Investigations
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Missing Persons Investigations
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The Gods of Guilt
The Gods of Guilt
Michael Connelly

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The Wrong Side of Goodbye
The Wrong Side of Goodbye
Michael Connelly

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King & Maxwell
King & Maxwell
David Baldacci

from $4.19

The Silkworm
The Silkworm
Robert Galbraith

from $3.99

Iron Lake
Iron Lake
William Kent Krueger

from $7.69

The Bitterroots
The Bitterroots
C.J. Box

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The Big Sleep
The Big Sleep
Raymond Chandler

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Fool Moon
Fool Moon
Jim Butcher

from $4.99

The Recovery Agent
The Recovery Agent
Janet Evanovich

from $4.69

The No. 1 Ladies' Detective Agency
The No. 1 Ladies' Detective Agency
Alexander McCall Smith

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Private Investigation

G is for Gumshoe
G is for Gumshoe
Sue Grafton

from $4.19

Blue Shoes and Happiness
Blue Shoes and Happiness
Alexander McCall Smith

from $4.19

The Long Way Home
The Long Way Home
Andrew Klavan

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The Forgotten Man
The Forgotten Man
Robert Crais

from $5.19

Chasing the Moon
Chasing the Moon
A. Lee Martinez

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The Buck Stops Here (The Million Dollar Mysteries, 5)
The Buck Stops Here (The Million Dollar Mysteries, 5)
Mindy Starns Clark

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Soft Focus
Soft Focus
Jayne Ann Krentz

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To Trust a Stranger
To Trust a Stranger
Karen Robards

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Body Movers
Body Movers
Stephanie Bond

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Missing
Missing
Lynette Eason

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Indigo Slam
Indigo Slam
Robert Crais

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Lullaby Town
Lullaby Town
Robert Crais

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Riley in the Morning
Riley in the Morning
Sandra Brown

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The River Knows
The River Knows
Amanda Quick

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Fast Women
Fast Women
Jennifer Crusie

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47
47
Walter Mosley

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2 Bodies for the Price of 1
2 Bodies for the Price of 1
Stephanie Bond

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Rhode Island Red
Rhode Island Red
Charlotte Carter

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Hell's Bells
Hell's Bells
John Connolly

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The Red Heart of Jade
The Red Heart of Jade
Marjorie M. Liu

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Betrayal

Suspect
Suspect
Robert Crais

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Sex Lies and Serious Money
Sex Lies and Serious Money
Stuart Woods

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Shadow of Doubt (Newpointe 911 Series #2)
Shadow of Doubt (Newpointe 911 Series #2)
Terri Blackstock

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Untouchable
Untouchable
Jayne Ann Krentz

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Early Autumn
Early Autumn
Robert B. Parker

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Dark Hollow
Dark Hollow
John Connolly

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Sue Grafton DEF Gift Collection: "D" Is for Deadbeat, "E" Is for Evidence, "F" Is for Fugitive
Sue Grafton DEF Gift Collection: "D" Is for Deadbeat, "E" Is for Evidence, "F" Is for Fugitive
Sue Grafton

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Orchid Blues
Orchid Blues
Stuart Woods

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Hostage
Hostage
Robert Crais

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A Fistful of Collars
A Fistful of Collars
Spencer Quinn

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Big Sky
Big Sky
Kate Atkinson

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A Deadly Shade of Gold
A Deadly Shade of Gold
John D. MacDonald

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Pale Kings and Princes
Pale Kings and Princes
Robert B. Parker

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Moving Target
Moving Target
J.A. Jance

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Mortal Stakes
Mortal Stakes
Robert B. Parker

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Robert B. Parker's Little White Lies
Robert B. Parker's Little White Lies
Ace Atkins

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The Professional
The Professional
Robert B. Parker

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Beyond Control
Beyond Control
Kat Martin

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Vermilion Drift
Vermilion Drift
William Kent Krueger

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Gone, Baby, Gone
Gone, Baby, Gone
Dennis Lehane

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Mystery

Birds of a Feather
Birds of a Feather
Jacqueline Winspear

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The Bungalow Mystery
The Bungalow Mystery
Carolyn Keene

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Stalking the Angel
Stalking the Angel
Robert Crais

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Class Act: A Stone Barrington Novel
Class Act: A Stone Barrington Novel
Stuart Woods

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A Delicate Touch
A Delicate Touch
Stuart Woods

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The Clue in the Diary
The Clue in the Diary
Carolyn Keene

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J is for Judgment (Kinsey Millhone #10)
J is for Judgment (Kinsey Millhone #10)
Sue Grafton

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Swimming To Catalina
Swimming To Catalina
Stuart Woods

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The Sentry
The Sentry
Robert Crais

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The First Rule
The First Rule
Robert Crais

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Devil in a Blue Dress
Devil in a Blue Dress
Walter Mosley

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The Promise
The Promise
Robert Crais

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Dog on It
Dog on It
Spencer Quinn

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The Mapping of Love and Death : A Maisie Dobbs Novel
The Mapping of Love and Death : A Maisie Dobbs Novel
Jacqueline Winspear

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2 Sisters Detective Agency
2 Sisters Detective Agency
Candice Fox

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Stone Cold
Stone Cold
Robert B. Parker

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Free Fall
Free Fall
Robert Crais

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The Wanted
The Wanted
Robert Crais

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L Is for Lawless
L Is for Lawless
Sue Grafton

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Journey to Munich
Journey to Munich
Jacqueline Winspear

from $6.69

Mystery, Thriller & Suspense

The Consequences of Fear
The Consequences of Fear
Jacqueline Winspear

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Sea Change
Sea Change
Robert B. Parker

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Sue Grafton: Three Complete Novels; A is for Alibi; B is for Burglar; C is for Corpse (The Kinsey Millhone Alphabet Mystery Series)
Sue Grafton: Three Complete Novels; A is for Alibi; B is for Burglar; C is for Corpse (The Kinsey Millhone Alphabet Mystery Series)
Sue Grafton

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The Wild One
The Wild One
Nick Petrie

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Inherent Vice
Inherent Vice
Thomas Pynchon

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The Sentence is Death
The Sentence is Death
Anthony Horowitz

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Black Dog: A Stone Barrington Novel
Black Dog: A Stone Barrington Novel
Stuart Woods

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L.A. Requiem
L.A. Requiem
Robert Crais

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L.A. Dead
L.A. Dead
Stuart Woods

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To Die but Once
To Die but Once
Jacqueline Winspear

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Curious Minds
Curious Minds
Janet Evanovich

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"P" Is for Peril
"P" Is for Peril
Sue Grafton

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The Long Goodbye
The Long Goodbye
Raymond Chandler

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Nightmare in Pink
Nightmare in Pink
John D. MacDonald

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Tears of the Giraffe
Tears of the Giraffe
Alexander McCall Smith

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Stranger In Paradise
Stranger In Paradise
Robert B. Parker

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Private Justice
Private Justice
Terri Blackstock

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A Cold Day in Paradise
A Cold Day in Paradise
Steve Hamilton

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Private Sydney
Private Sydney
James Patterson

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Thereby Hangs a Tail (A Chet and Bernie Mystery, #2)
Thereby Hangs a Tail (A Chet and Bernie Mystery, #2)
Spencer Quinn

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Police Corruption

Farewell, My Lovely
Farewell, My Lovely
Raymond Chandler

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Valediction
Valediction
Robert B. Parker

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Chance
Chance
Robert B. Parker

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Robert B. Parker's Payback
Robert B. Parker's Payback
Mike Lupica

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The High Window
The High Window
Raymond Chandler

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The Woman in the Woods
The Woman in the Woods
John Connolly

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Poodle Springs
Poodle Springs
Robert B. Parker

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Stardust
Stardust
Robert B. Parker

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Small Vices
Small Vices
Robert B. Parker

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The Little Sister
The Little Sister
Raymond Chandler

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The Alibi Man
The Alibi Man
Tami Hoag

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Far from True
Far from True
Linwood Barclay

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Bad Business
Bad Business
Robert B. Parker

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Hugger Mugger
Hugger Mugger
Robert B. Parker

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Now & Then
Now & Then
Robert B. Parker

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Murder in the Marais
Murder in the Marais
Cara Black

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Hush Money
Hush Money
Robert B. Parker

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A Tap on the Window
A Tap on the Window
Linwood Barclay

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Playback
Playback
Raymond Chandler

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IQ
IQ
Joe Ide

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Thriller

Treasure State: A Cassie Dewell Novel
Treasure State: A Cassie Dewell Novel
C.J. Box

from $4.29

Hot Mahogany
Hot Mahogany
Stuart Woods

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Inherit the Dead
Inherit the Dead
C.J. Box

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Nothing Ventured
Nothing Ventured
Jeffrey Archer

from $4.79

Ceremony
Ceremony
Robert B. Parker

from $4.79

The Two Minute Rule
The Two Minute Rule
Robert Crais

from $4.49

The Quick Red Fox
The Quick Red Fox
John D. MacDonald

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Copper River
Copper River
William Kent Krueger

from $10.99

Looking For Rachel Wallace
Looking For Rachel Wallace
Robert B. Parker

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Sacred
Sacred
Dennis Lehane

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Blood Is the Sky
Blood Is the Sky
Steve Hamilton

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Twelve Mile Limit
Twelve Mile Limit
Randy Wayne White

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One Fearful Yellow Eye
One Fearful Yellow Eye
John D. MacDonald

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Old Black Magic
Old Black Magic
Ace Atkins

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An Eye for an Eye
An Eye for an Eye
Irene Hannon

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Against the Night (The Raines of Wind Canyon, #5)
Against the Night (The Raines of Wind Canyon, #5)
Kat Martin

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Sleep Like a Baby
Sleep Like a Baby
Charlaine Harris

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A Stolen Season
A Stolen Season
Steve Hamilton

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The Unquiet
The Unquiet
John Connolly

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Pale Gray for Guilt
Pale Gray for Guilt
John D. MacDonald

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Common themes among these books on private investigation include: solving mysteries, uncovering conspiracies, navigating dangerous situations and criminal underworlds, protecting clients from threats and danger, dealing with personal struggles and past traumas, and using unique skills or abilities (such as supernatural powers or animal partners) to solve cases. Many of the books feature strong and complex protagonists who are skilled in their work but also have flaws and personal challenges to overcome. The settings range from modern-day cities to historical eras, and the types of cases vary widely from missing persons to murders to financial scams.

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