To avoid suspicion, Dexter's had to slip deep into his disguise: spending time with his girlfriend and her kids, slowly becoming the world's first serial killing couch potato.

Then a particularly nasty psychopath starts cutting a trail through Miami -- a killer whose twisted techniques leave even Dexter speechless. When his sister Deborah, a tough-as-nails cop, is drawn into the case, it becomes clear that Dexter will have to do come out of hiding and hunt the monster down. Unless, of course, the killer finds him first. . .