From Hugo and Nebula Award-winning author, Robert Silverberg comes the classic: The Book of Skulls. Four friends embark on a cross-country trip in search of a legendary monastery. There, they hope to find the secrets of immortality promised in an ancient manuscript, the Book of Skulls There, they will present themselves-and pay the horrific price demanded. For immortality requires sacrifice. Two victims to balance two survivors. One by suicide, one by murder. Beneath the gaze of grinning skulls, the terror begins. . . .