While diving in Lake Superior with his marine archeology partner, Tate Masters discovers a deceased diver trapped on a historic schooner shipwreck. After recovering the body, Tate is shocked to find that the diver was carrying diamonds -- not something you would typically find on an old iron ore carrier. It doesn't take long for the word to get out, and now there is a race to find the source of the diamonds and, more importantly, whether there are more to be found. Without expecting it, Tate is thrust into a world of history, intrigue, and danger as he unravels this deep-sea mystery. Lovers of Clive Cussler, will delight in this SCUBA diving thriller.