Harry Potter wakes at Camp Half-Blood. Percy Jackson wakes at Hogwarts. Neither know who they are, where they are, or where they come from, but when dreams are invaded, prophecies are conjured and revelations arise, they discover the line between demigod and wizard is blurring. Something dark is coming, and Percy and Harry must unite with their new peers before it's too late.

Anybody related to Voldemort must be inherently evil... right? Harry Potter thinks so. Nobody good could come from Voldemort. When Dumbledore announces that Voldemort has a grandson named Percy Jackson, Harry's already labeled Percy as EVIL and put him on his enemy list. But Percy Jackson is not whats expected by a long shot and he's not going to take any prejudices lying down...