Kit takes her role as London's notorious "Perfect Killer" seriously. The letters and cash that come to her via a secret mailbox are not a game; choosing who to kill is not an impulse decision. Her moral nihilism and thus her murders are a way of life—the only way of life she has ever known.

But when a letter appears in the mailbox that will have the power to topple Kit's convictions as perfectly as she commits her murders, she must make a decision: follow the only rules she has ever known, or challenge Rule One and go from there.

Katherine Ewell's Dear Killer is a sinister psychological thriller that explores the thin line between good and evil, and the messiness of that inevitable moment when life contradicts everything you believe.