Danny is a human attack dog for a powerful mobster he calls Uncle Bart. When Bart and his men go out on their collection runs, they bring Danny, who has been trained since he was a child to fight to kill. But when a turf war ends up in bloody carnage, Danny escapes and is taken in by a kind family consisting of blind piano tuner Sam and his teenage stepdaughter, Victoria. They teach Danny how to be a real person, to be able to act civilly in society. They also allow Danny to explore his love of the piano, where a specific tune haunts him, bringing up repressed memories from his long-ago past. Just when Danny thinks he has escaped from his former life, he is pulled back in, but he is no longer the trained dog Bart thinks he is.