"After escaping the bog-men in the wilds of the Witchwood, Sebastian, Quinn, Elanor and Tom journey south on their impossible quest. Sebastian and Elanor seek help from Crowthorne Castle, but both allies and enemies will reveal themselves. Tom and Quinn venture into the mysterious moors...where a hideous beast lies waiting."--Back cover.

"Quinn, Sebastian, Elanor and Tom have defeated the black witch Githa and found the last crucial piece of the prophecy--the sea serpent's scale. But time is running out. Back now at Wolfhaven, they search desperately through the castle crypts for the sleeping heroes who they hope will save them all...before the dark moon rises and they lose everything."--Back cover.

"Our heroes are back. Kind of. First, the bad news: an ancient evil - you know, your standard consume-all-life-in-the-galaxy deal - is about to be unleashed. The good news? Squad 312 is standing by to save the day. They've just got to take care of a few small distractions first. Like the clan of gremps who'd like to rearrange their favorite faces. And the cadre of illegit GIA agents with creepy flowers where their eyes used to be, who'll stop at nothing...

"Forced to flee Thebes or face death, Sesha and her friends, Paser and Reb, travel up the Nile and into the desert in search of a hidden oasis. Led by a freed spy, they plan to rescue Pharaoh's daughter Princess Merat, given to a Hyksos chieftain against her will. Before they can get there, though, they have to battle lurking crocodiles, endless dunes, and blinding sandstorms. When the group finally straggles into the Hyksos camp, they find the rebels...

Annabeth and Percy have tumbled into a pit leading straight to the Underworld. The other five demigods have to put aside their grief and follow Percy's instructions to find the mortal side of the Doors of Death. If they can fight their way through the Gaea's forces, and Percy and Annabeth can survive the House of Hades, then the Seven will be able to seal the Doors both sides and prevent the giants from raising Gaea. But, Leo wonders, if the Doors...

"Quinn, Sebastian, Elanor and Tom have found a dragon and conquered the dreaded Beast of Blackmoor Bog. Only one item remains on their impossible quest--the scale of a sea serpent. Now they must journey to the drowned kingdom, where they will face their deadliest challenge yet. And there they will uncover the truth behind all that has happened...the truth that will change everything."--Back cover.