Bart has trained Danny, from when he was 4 years old. Danny is his secret weapon, attacking anyone as soon as he's ordered to, and without giving him slightest chance of survival. Danny has no other choice but to accept this beastly existence, until he meets Sam, a blind man who makes his living as a piano tuner. Sam and his stepdaugther, Victoria, introduce Danny to humanity that he has never known before. His entire perception of life as he knows is shaken to the core. Now, up against Bart and his gang, Danny will try to become himself finally and to penetrate into the secrets of his past. To escape his condition, Danny will have to break away while still protecting those who now constitute his family.