Caitlin and Alma have continued Mary and Frida's work as union organizers, but when Caitlin has a disturbing dream about her childhood friend, Duncan the ghost, she decides to return to Boston to find out what's wrong. Though it is a happy reunion with Samuel and Granville, something much more sinister awaits her and the team.This is the third standalone sequel to the Boston Metaphysical Society series about an ex-Pinkerton detective, a spirit photographer,...