Diving deep into the cold gray-green depths of Lake Superior, Matt and Tanya follow the algae-coated links of an old anchor chain to a mysterious shipwreck. The discovery of the ship's log heightens the mystery and locks them in a vicious struggle with a pair of powerful, and deadly, business moguls determined to keep the past buried. The adventure catapults them into a wicked world of kidnapping, bribes, corporate subterfuge, and murder as the action plunges deep underwater, soars airborne, and careens through the northern Michigan woods.