On a routine crabbing expedition in the Bering Sea, Charlie Mears and the rest of the men aboard the trawler Borealis discover something unbelievable: a young woman running naked along the ridge of a passing iceberg. The men rescue her and bring her aboard the boat. But they will soon learn her horrible secret. By the time they find out why she was alone on the ice—and what she truly is—the nightmare will have begun, as one by one she infects them with an evil that brings about unimaginable terrors.