Long hailed as the grand master of adventure fiction, Clive Cussler has continued to astound with the intricate plotting and astonishing set pieces of his novels. Now, with a surprising twist, he gives us his most audacious work yet. In the final pages of *Valhalla Rising*, Dirk Pitt discovered, to his shock, that he had two grown children he had never known-twenty-three-year-old fraternal twin...