Mary is a pay killer who works for a Boston organized crime family. Mary’s life is completely overwhelmed when she meets a boy during a hit that does not work at all. Mary, a cold and rebellious woman, will uncover her unpredictable motherly instinct, which she has repressed all her life and decides to protect the boy with the cost of living. She is determined to start a new life with the boy, but her former boss is not so excited about Mary’s decision.