Who I'm not

"Danny has been a con man in training for most of his young life, but nothing has prepared him for the con of his life: impersonating a missing boy. Much to his astonishment, his new 'family' accepts him as their own--despite the fact that he looks (and sounds) nothing like their missing relative. But one old cop has his suspicions about Danny--and he's not about to close the case"--P. of cover.