Night of the Sharks (La notte degli squali)

Still waters run deep, dark and deadly.

David Ziegler (Treat Williams) is a marked man. He's got something that a powerful corporation has killed for—and will kill for again: a CD containing evidence of their illegal activities. His brother James (Charles Mucary), who extorted a cool two million in diamonds for the disc but then made the deadly mistake of returning a fake, was murdered—but not before he told David where he could find the real disc along with the diamonds. Now David is their target, and when they come to Mexico looking for him, he'll be ready; and he'll get his revenge.