Beast

"Makes the shark from "Jaws" look like a pet goldfish . . ." USA Weekend
Straight from the cutting edge of science and the logs of ancient mariners comes an immense horror -- a creature that rises up from the well of an ocean gone mad with an insatiable hunger and an endless lust to kill. One man leads a harrowing struggle to defeat the beast amid a threatened Bermuda paradise. His name is Whip Darling, a down-and-out sea dog who doesn't know where he'll get his next meal -- or whether it will get him first.
From the Paperback edition.