Rule One: Nothing is right, nothing is wrong.
Rule Two: Be careful.
Rule Three: Fight using your legs whenever possible, because they're the strongest part of your body.
Rule Four: Hit to kill. The first blow should be the last, if at all possible.
Rule Five: The letters are the law.

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. Every letter she receives begins with "Dear Killer," and every time Kit murders, she leaves a letter with the dead body. 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's 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.