From #1 New York Times bestselling author Michael Crichton, a riveting science fiction thriller about group of scientists sent to investigate a ship resting on the ocean floor and a discovery that defies imagination.

"Crichton keeps us guessing at every turn."--Los Angeles Times

"A page-turner. . . . Cinematic, with powerful visual images and nonstop action."--Newsweek

In the middle of the South Pacific, a thousand feet below the surface of the water, a huge vessel is discovered resting on the ocean floor. It is a spaceship of phenomenal dimensions, apparently undamaged by its fall from the sky. And, most startling, it appears to be at least three hundred years old. But even more fantastic--and frightening--is what waits inside . . .