Allen Zadoff: 3 books

They needed the perfect assassin. Boy Nobody is the perennial new kid in school, the one few notice and nobody thinks much about. He shows up in a new high school in a new town under a new name, makes a few friends, and doesn't stay long. Just long enough for someone in his new friend's family...

The Program has sent Boy Nobody on countless missions, instructed to kill whichever target he was given. But now, after going rogue, he is on his own mission to rescue his friend Howard, who was captured by The Program. Boy Nobody manages to free Howard as well as Tanya, a mysterious girl who...

He was the perfect assassin. Boy Nobody: No name. No past. No remorse. At least until he began to ask questions and challenge his orders -- until he fell in love with his target. Now The Program is worried that its valuable soldier has become a liability. Boy Nobody, haunted by the outcome...