Nickel is a survivor. He has to be. For as long as he can remember, his life has hinged on the flip of a coin. Or, rather, the scribble of a social worker’s pen. He’s been through the system, even had a good dad for a few years, until he was gone, too. But Nickel remembers everything he taught him, and since the day he escaped from foster-care hell, he’s put that knowledge to good use. Just twelve years old, he makes a steady living by selling marijuana to high schoolers, blackmailing pedophiles he ferrets out online, and working as…