On Mexico's Sea of Cortez a marine biologist prepares to encounter an animal local fisherman fear more than sharks. He is exploring a nether-world between fantasy and fact, pursuing a legendary monster of the deep that does, in fact, exits... Around the world, strange carcasses drift ashore, and fishermen catch huge creatures they have never seen before. Bit by bit, the secret life of this strange animal is becoming known. We can study its anatomy and the behavior of its smaller relatives - the bizarre and wonderful creatures called cephalopods. If they did live anywhere where a man lived, they would make mince-meat of him in no time. Fiction has always branded the giant squid a ferocious enemy of man, and some of its close relations can be terrifying indeed. Master of the deep ocean, the sperm whale knows what we cannot, but recently scientists have found a way to learn its secrets. Whales were known to feed on squids, so it made sense to me try to use the sperm whale as our hound dog to lead us to the giant squid.