An unbelievably gripping, completely original novel about a woman working as a matchmaker for a very specific clientele—psychopaths—who finds herself in danger...from the bestselling author behind Love Letters to a Serial Killer.

Lexie was expecting a nice evening with her fiancé for her birthday. Instead, her best friend is sitting next to her man, and what’s worse: They’re in love.

To escape her relationship troubles, Lexie throws herself into her job where she works as a matchmaker for psychopaths—a label that the clients themselves are unaware of—and becomes entangled with two of her most recent clients, both of whom have mysterious pasts that inspire Lexie to breech work protocol and spend time with them outside of the office. One of them, Rebecca, becomes a candidate to take on the role of Lexie's new best friend, while the other, Aidan, claims that he and Lexie are soulmates and meant to be together despite her insistence that her significant other is going to return in time for their scheduled wedding.

When her fiancé goes missing and threatening packages begin arriving at her doorstep, Lexie has to figure out who is trying to target her and how it relates to her own dark past. Can she trust her instincts as a matchmaker or has she set herself up with her enemy?