Get your hands on these two thrilling novels by Clive Cussler, featuring the iconic protagonist Dirk Pitt. These hardcover books are signed by the author himself and come with a dust jacket, making them a valuable addition to any book collection. The novels are part of the Dirk Pitt Novels series and were published in 2001 and 2019 by G.P. Putnam's Sons. The first book, Celtic Empire, takes readers on an adventure through ancient Scotland and the mystical world of Celtic warriors. The second book, Valhalla Rising, follows the thrilling exploits of Dirk Pitt as he races to uncover the truth about his family's past. Both books are in English and are perfect for adults who love adventure and mystery genres. Don't miss out on this opportunity to own a piece of literary history.