"A fearless exploration of the line between mental illness and true evil, a place many thriller writers visit but without the kind of fearless insights Tawni] O'Dell reveals in this powerful novel" (The New York Times Book Review). Dr. Sheridan Doyle--a fastidiously groomed and TV-friendly forensic psychologist--is the go-to shrink for the Philadelphia District Attorney's office whenever a twisted killer's mind eludes other experts...