The Rule of Four

Princeton Good Friday, 1999. On the eve of graduation, two students are a hairsbreadth from solving the mysteries of the Hypnerotomachia Polipholi, a Renaissance text that has baffled scholars for centuries. Famous for its hypnotic power over those who study it, the five-hundred-year-old Hypnerotomachia may finally reveal its secrets - to Tom Sullivan, whose father was obsessed with the book, and paul Harris, whose future depends on it. But as the deadline looms, research has stalled - until an ancient diaty surfaces. What Tom and paul discover inside shocks even them: proof that the location of a hidden crypt has been ciphered within the pages of the obscure Renaissance text.