A drowned man is a dead man...so how did this one disappear? Meet Michelle "Mitch" Mitchell— tough, young single mom and a gutsy deepwater diver. As a favor to her hometown sheriff, Mitch has agreed to an ugly job; diving in the black waters of Michigan's Huron Harbor. Mitch descends into the murky darkness of the Odawa River to find Jimmy Calderon, who ran his car off a rain-slicked road. The car is there, but Jimmy isn't. The police call it an "unfortunate accident," but Mitch thinks there's a lot more to it. She may getting in over her head, but she knows the answers lie deep under the deadly...