THE RULE OF FOUR (AUDIO-CD)

It's Easter at Princeton and two students, Tom Sullivan and Paul Harris, are a hair's breadth from solving the mysteries of the Hypnerotomachia Poliphili -- a renowned text attributed to an Italian nobleman, a work that has baffled scholars since its publication in 1499. But as their deadline looms, research has stalled -- until a long-lost diary surfaces with a vital clue. And when a fellow researcher is murdered just hours later, Tom and Paul realize that they are not the first to glimpse the Hypnerotomachia's secrets.