Dirk Pitt, Clive Cussler's aging but still potent superhero, returns in the 16th adventure in this popular series about the director of special projects for the National Underwater Maritime Administration (NUMA). Pitt's NUMA survey ship happens to be in the vicinity when the world's newest and biggest cruise ship founders and sinks, giving Pitt the chance to stage the daring rescue of nearly 2,000 passengers. Among those who perish is a famous scientist whose revolutionary engines powered the ship to her watery grave; while Pitt is unable to save Dr. Egan, he rescues his beautiful daughter Kelly from the sea, and later from a murder attempt aboard the rescue vessel. Pitt and his trusty pal Al Giordino track the sinking to the boardroom door of a multinational conglomerate called Cerberus, whose evil CEO has designs on the world's oil supply. He'll do anything to keep Egan's advanced engines and secret formula for frictionless oil off the market--even sabotage another vessel, this time a luxury passenger submarine. By the time our heroes have foiled the mastermind's nefarious plots, they've also uncovered the existence of a working submarine nearly a century before one actually existed--irrefutable proof of a Viking landing on the Hudson River--and the remains of the British sailor who inspired Jules Verne's Captain Nemo. A solid page-turner that even features a cameo appearance by the author himself, Valhalla Rising snaps, crackles, and pops with Cussler's usual brio. --Jane Adams