"Percy Jackson isn't expecting freshman orientation to be any fun. But when a mysterious mortal acquaintance appears on campus, followed by demon cheerleaders, things quickly move from bad to diabolical. In this latest installment of the blockbuster series, time is running out as war between the Olympians and the evil Titan lord Kronos draws near. Even the safe haven of Camp Half-Blood grows more vulnerable by the minute as Kronos's army prepares...

At the end of recess at Eerie Elementary, everything on the school grounds suddenly comes alive and turns into a fog-filled jungle maze intent on trapping and disposing of hall monitor Sam Graves and his friends Antonio and Lucy.

Newt has been to hell and back with his friends. The Glade. The Maze. The Scorch. The inner halls of WICKED. But now he has a burden that can't be shared with Thomas and the other, the Flare. And Newt can't bear the thought of his friends watching him descend into madness as he succumbs to the virus. Leaving only a note, Newt departs the Berg before the Gladers return from their mission into Denver, Colorado. From there, he experiences the gritty...

Skull, the Shadow, and a few of the rat army escaped into Perodia, and now Tag and the other defenders must locate them, and also find their friend, Bod, who is still trapped in the Underland with the rest of the rat army.