At the conclusion of The Mark of Athena, Annabeth and Percy tumble 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....

"The Greek and Roman demigods must simultaneously prevent the earth mother, Gaea, from waking and stop war from breaking out at Camp Half-Blood"-- Provided by publisher.

Turtle the SeaWing dragon has long dreamed of being a hero, but when the companioinadvertentlytly free Darkstalker, the oldest and most powerful dragon, from the spell that has trapped him, the best he can come up with is a spell that prevents the ancient dragon from seeing him or hearing his thoughts--Darkstalker claims he has changed, but Turtle suspects that he still plans to control dragonkind.

Winter has been a disappointment to his royal IceWing family, unlike his sister Icicle, who has been raised to challenge IceWing queen--but now that Icicle has broken the truce and escaped from Jade Mountain Academy, so Winter, accompanied by his new clawmates, Moon, Qibli, and Kinkajou, embarks on his own quest to free his brother from the clutches of Queen Scarlet, and win the respect of his family.

"Peril is possibly the most dangerous dragon in Pyrrhia, because she has firescales that can kill an opponent with a touch, but now she has a mission--find her former queen, Scarlet, who is threatening the Jade Mountain Academy, and then stop her, and she is not sure if the persistent SeaWing, Turtle, who is accompanying her will be a help or a hindrance." -- Provided by publisher.

"Thor's hammer is missing again. The thunder god has a disturbing habit of misplacing his weapon--the mightiest force in the Nine Worlds. But this time the hammer isn't just lost, it has fallen into enemy hands. If Magnus Chase and his friends can't retrieve the hammer quickly, the mortal worlds will be defenseless against an onslaught of giants. Ragnarok will begin. The Nine Worlds will burn. Unfortunately, the only person who can broker a deal for...

Magnus Chase has always been a troubled kid. Since his mother's mysterious death, he's lived alone on the streets of Boston, surviving by his wits, keeping one step ahead of the police and the truant officers. One day, he is tracked down by a man he's never met -- a man his mother claimed was dangerous. The man tells him an impossible secret: Magnus is the son of a Norse god. The Viking myths are true. The gods of Asgard are preparing for war. Trolls,...

For centuries there have been rumors of another continent on the dragons' planet -- another land far across the ocean, populated by tribes of dragons very different from those we know. But there's never been any evidence, and most dragons dismissed the rumors as fairy tales. Until now. Because it turns out the stories are true. And the other tribes are coming.

Twenty years ago, all the evil villains were banished from the kingdom of Auradon and made to live in virtual imprisonment on the Isle of the Lost. The island is surrounded by a magical force field that keeps the villains and their descendants safely locked up and away from the mainland. Life on the island is dark and dreary. It is a dirty, decrepit place that's been left to rot and forgotten by the world. But hidden in the mysterious Forbidden Fortress...

"When assassins ambush her best friend, Rielle Dardenne risks everything to save him, exposing herself as one of a pair of prophesied queens: a queen of light, and a queen of blood. To prove she is the Sun Queen, Rielle must endure seven elemental magic trials. If she fails, she will be executed...unless the trials kill her first. One thousand years later, the legend of Queen Rielle is a fairy tale to Eliana Ferracora. A bounty hunter for the Undying...