Victor Maynard is a middle-aged, meticulous hitman living under the shadow of his overbearing, assassin mother. Trained since birth, Victor's existence is cold and routine-driven, but his life takes a turn when he is hired to eliminate Rose, a free-spirited and unpredictable thief who has conned a powerful gangster. During the attempt, Victor finds himself unable to carry out the mission, enchanted by Rose's charm and whimsical nature. This decision leads to unexpected consequences, including a budding alliance between Victor, Rose, and an unsuspecting young man named Tony, who gets entangled in the chaos.

As Victor defies his violent profession and protects Rose and Tony, the three form a makeshift family unit, dodging peril at every turn while uncovering deeper personal connections. Their journey is fraught with danger as they evade other assassins and deal with their own dysfunctional dynamics. Through a series of close calls, comedic exchanges, and growing camaraderie, Victor starts to experience emotions he has long suppressed, including a sense of belonging and affection. However, their newfound bond is constantly tested as the world of crime they seek to escape from continues to close in on them.