Above & Below

Researchers on the undersea lab Aquatica have genetically altered the brains of captive sharks to develop a cure for Alzheimer's disease. But there's an unexpected side effect: the sharks got smarter, faster, and more dangerous. After a big storm damages their remote research facility, they must fight for their lives.

A gunrunner loses his cargo near a small coastal Sudanese town so he's stuck there. When a woman hires him to raid a sunken ship in the shark-infested waters, he sees a chance to compensate for his losses. He's not the only one.

A weekend cruise on a luxurious party yacht goes horribly wrong for a group of old high-school friends when they get stuck in the water many miles from shore and a happy reunion turns into a fight for survival.

A prehistoric shark (named in the books "megalodon") lurks Mallorca, killing a couple of individuals. A professional diver begins the hunt.

A professor tries to convince the residents of a small town that a series of attacks are the handiwork not of mountain animals but of a rare river-dwelling shark.