Professor Amos Frost thought he was going to enjoy a quiet sabbatical visiting old friends on Florida's Gulf coast with his son Windy.until one day they went fishing in Amos' dory. To their astonishment, they discovered weird, injured fish swimming disjointedly beneath the bay water. Disappointed in their fishing expedition and puzzled by the odd behavior of the fish, the two had already turned back to shore when hungry sharks, drawn in from the outer Gulf for an easy meal, hit the vulnerable fish with a vengeance, almost sinking Amos' small boat and actually devouring a nearby fisherman who fell into the sharks' feeding frenzy. What had caused such catastrophic damage to the fish, luring predator sharks into the bay? How had it happened and who was responsible? Amos sets out on a dangerous course to find the answer.