Spawns of Da Vinci Code

The latest shortcut to publishing stardom: Renaissance mysteries. At the center of this new genre is the work of two friends who were interested in The Hypnerotomachia Poliphili, a manuscript published in Venice in the 15th century. Dinitia Smith explains it all here. The Rule Of Four has debuted at Number 6 in the NY Times bestseller list.
Link via Bookninja.