Something fishy is going on down at Laguna Pequeña beach. The ocean has turned into an aquatic nightmare. A grotesque giant squid, a hideous herring with razor-sharp teeth, and a gruesome fifty-foot shark have laid siege to the shore--and many lay the blame on Tom Swift's latest oceanic research!

Tom is using growth hormones to create huge fish, hoping to help feed starving people around the world. Convinced that his experiment is safe, he believes that the true source of the beasts from the deep lies elsewhere. Tom also suspects that a deranged scientist is about to take one more horrifying step: the genetic alterations of human beings!
(from the publisher)