After more than a quarter century of chronicling the aquatic adventures of action hero Dirt Pitt, Cussler (Flood Tide; Shock Wave) has finally decided to cast his line in somewhat different waters. Co-written by veteran mystery author Paul Kemprecos (Bluefin Blues; The Mayflower Murder), this novel still features the sturdy men and women of the National Underwater Marine Agency, plenty of hair-raising derring-do and a convivial cast of characters engaged in an outlandishly hatched thrill ride. The stars of this show are NUMA divers Kurt Austin and Joe Zavala, two young bucks without the seasoning and panache of Pitt but worthy successors, nonetheless. They are trying to find out why top archeologists are being killed, some of them butchered, at dig sites.