Off the coast of California, deep beneath the waves, in the wreck of an atomic submarine, a creature named Grue broods. Someone has thrown Shakespeare's plays into the sea in cola bottles, and by reading them, Grue discovers a sense of his own humanity. Now he no longer wants to eat teenagers, no matter how much their out-of-control hormones call to him or how the crabs that scavenge his kills urge him on. Grue wants to join the world above, and when his first attempt ends...poorly, Grue searches for the person who cast the plays into the sea. Who he finds is Giulietta, an agoraphobic trapped in a dry-docked yacht, waiting for love. When she and Grue meet, Giulietta believes her prayers have been answered. But teenagers have disappeared, and her nephew is the prime suspect. Giulietta suspects Grue knows more than he's saying, and Grue has to decide if being a new man means ignoring the monster he was.