"Lab 6" por Peter Lerangis
O resumo Google book é:
Something is wrong in Lab 6—what are Sam’s parents hiding?
Sam Hughes has always been too smart for his own good. It’s in his genes—both his parents are scientists who specialize in artificial intelligence—and sometimes it gets him into trouble. Sick of the bully who always steals his computer homework, Sam gives him a disk laced with a virus as a prank. To escape the bully’s wrath, Sam runs and hides in his parents’ lab. Inside, Sam hears a voice calling to him from behind a locked door labeled “Lab 6.” His parents are in there, and though he can hear them, he doesn’t understand what they’re talking about. Are his parents hiding a body in their lab? Something strange is going on, and Sam knows the answers lie somewhere in Lab 6.
Outro do Goodreads :
Sam's parents are trying to extract his twin -- who's still inside Sam's body.