The reader is introduced to Soren, a barn owl and the centerpiece of the series. When Soren is pushed from his family's nest by his older brother, he is rescued from certain death on the forest floor by agents from a mysterious school for orphaned owls, St. Aggie's. When Soren arrives at St. Aggie's, he suspects there is more to the school than meets the eye. He and his new friend, the clever and scrappy Gylfie, find out that St. Aggie's is actually...

"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 Percys instructions to find the mortal side of the Doors of Death. If they can fight their way through the Gaeas forces, and Percy and Annabeth can survive the House of Hades, then the Seven will be able to seal the Doors from both sides and prevent the giants from raising...