Jason Grace wakes up on a school bus, supposedly headed for a field trip, completely disoriented. He has no memory of Leo Valdez, claiming to be his best friend, or Piper McLean, who appears to be his girlfriend. And when they arrive at the field trip destination, deadly winds and sudden flying powers further confuse Jason's mind. Is this all a dream, after all? But then Annabeth Chase arrives at the scene, wild-eyed and rambling, which confirms that all of this is very real. She drags Jason, Leo, and Piper to the mysterious Camp Half-Blood, where more danger - if that's possible - awaits. Now, the new demigod trio must save Hera and figure out the cause of Jason's loss of memory, but death may be patiently waiting on the other side. This earthshaking first book in the Heroes of Olympus sequel series will bring readers back to the mythical world of Percy Jackson, and leave them vying for more.