"The first book in a two-volume fantasy about a teenaged boy who inherits his grandfather's mansion and discovers three strange doors, evidence his grandfather did not die of natural causes but spectacularly unnatural ones, and clues to the family's ties to an alternate Europe immersed in a war fought with strange tech and dark magic"-- Provided by publisher.

Jonathan Lambshead will inherit has grandfather's mansion-- after he and two schoolmates catalog its contents. They discover that the mansion's basement contains portals, with one leading to an alt-Earth called Aurora. There magic abounds, history has been re-written, and an occult dictator called Aleister Crowley leads an army pillaging alt-Europe. Jonathan pieces together his destiny as a member a secret society devoted to keeping our world separate from Aurora. But alliances shift as the trio pursue the profound evil-- and discover it is also chasing them. -- adapted from jacket