Cook, primarily known for his medical thrillers, breaks from his usual pattern in this underwater adventure. When workers on an submerged mining station run into a number of problems while drilling in a remote part of the Atlantic Ocean's floor, the station owner takes it upon himself to investigate. Bizarrely, the investigation leads the drillers into the heart of a hidden city where the inhabitants have a vested interest in never leaving, nor allowing anyone else to leave....

Dr. Robin Cook (born May 4, 1940 in New York City, New York) is an American physician and novelist who writes about medicine and topics affecting public health.
He is best known for combining medical writing with the thriller genre. Several of his books have been bestsellers on the "New York Times" Bestseller List. Several of his books have also been featured in Reader's Digest.