I Am the Weapon (Unknown Assassin Series #1)

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 to die -- of "natural causes." Mission accomplished, Boy Nobody disappears, moving on to the next target.

But when he's assigned to the mayor of New York City, things change. The daughter is unlike any...