Manhattan-bred Beel-lee (Billy) tells this story of his visit to Shark Island where his father had befriended Skipper Dumont during the war. With Pierrot and his sister Veronique, Billy boards the sailing vessel, La Corsaire each day and gives vent to his dream of fishing, skin diving and just plain inhaling the salt air surrounding the beautiful Mediterranean. A hammerhead shark which has been threatening the livelihood of the Dumont family by devouring nets full of carefully trapped fish, challenges Billy's skill and imagination. Twice, he unsuccessfully battles the shark, barely escaping with his life. On the island of Corsica, an old bandit provides them with harpoons superior to those Billy had fashioned in a dramatic third bout with the monster, Billy is victorious. An unlikely tale with only its closeups of a shark in action to recommend it.