Kyle, Amber, and Zack figure they've got a pretty good handle on the zombies these days. Two down, two to go! Except that the next zombie on their hit parade is Isaac Lassiter--the big, bad undead dude with an ax stuck in his back. And he's not about to go quietly. Lassiter's teamed up with a clocked creepster named Dread, and Kyle's the only one who can stop them. It's the squad's toughest challenge yet. . . can they put this dastardly duo to rest before it's too late?