Two sisters. A lost imperial treasure. The world's greatest puzzle master has twenty-four hours to solve the most dangerous mystery of his life . . . or die trying, in " this] breathlessly paced and nail-bitingly suspenseful" (Booklist) novel from the New York Times bestselling author of The Puzzle Master, hailed as "thrilling" by David Baldacci. "This rip-roaring adventure thriller is an escapist puzzle box...