SOLVED. Action, thriller about a female assassin whose about 16 or 17 years old. The people give her the requests by putting a letter and the money for it in an envelope in a hidden space in a bathroom. [s]

[Kaylee]

I read this book about three or four years ago. It’s about a female assassin whose about 16 or 17 years old. The people give her the requests by putting a letter and the money for it in an envelope in a hidden space in a bathroom. She then picks which one would be more interesting and then fill that lerson’s request. Once it is done she wipes the letter for finger prints and then leaves it with the body for the writer to dead with the consequences. It’s just her and her mom, I don’t remember where the dad is, but he isn’t mentioned. I don’t remember what the mom does for work, (view spoiler)[ but I do remember that she does date a cop. (view spoiler)[ at the end the mother and daughter are fleeing because I believe that the cop knows that she is an assassin and he catches her at her house because she forgot something or something close to that. I don’t remember how it ends after that though. Any ideas? (hide spoiler)] (hide spoiler)]

[Mai]

Found this one via Google search: Dear Killer by Katherine Ewell
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.

[Kaylee]

Thank you so much! It’s been killing me what that book was called, but I couldn’t for the life of me remember.