**Death train.** Go-back, go-back, go-back... the steady sound of the train rushing over the tracks warns Hannah. She and her friends are on a trip that begins as a fun cross-country tour - until they learn what's on the train with them. A coffin. Frog's coffin. His real name was Rodger. But from the day he started at Parker High to the day of his sudden and horrible death, he was taunted and ridiculed, cruelly nicknamed Frog by his classmates. One by one, Hannah's friends guiltily confess the nasty things they did to Frog. And then, one by one, they are viciously attacked. It seems Frog is out for revenge. But Frog's dead - isn't he?