Wes Pilson was born first, healthy and mentally strong. His twin brother Eric, starved of oxygen, would suffer for his birth order with retardation and life in an institution. Now an idealistic young law student, Wes comes to Riverwood when he suspects that Eric is suffering abuse and can’t get either his parents or the police to take his claims seriously.
Two aides at Riverwood learn that Wes speaks Spanish, they enlist his help to find their missing friend, a Costa Rican girl named Rosa, who disappeared in the middle of her shift.
There is a mute witness to Rosa’s disappearance, a patient named Chad Lett who suffers from locked-in syndrome. After years of silence within a paralyzed body, he has established contact with Rosa through a single blinking eye, but then she is abducted and a staff member begins to administer dropperfuls of cleaning solution into his communicating eye.
Wes’s search will take him to familiar territory in the coastal rain forest of Costa Rica. And a crime committed under tropical waters, the dive known as El Bajo del Diablo—the Devil’s Deep.