Demigod Percy Jackson, still with no memory, and his new friends from Camp Jupiter, Hazel and Frank, go on a quest to free Death, but their bigger task is to unite the Greek and Roman camps so that the Prophecy of Seven can be fulfilled.

Written for the non-scientist, this classic work is a journey through time in space in search of evidence with which to support a new and radically different model of our planet. The book explores the hypothesis that the Earth's living matter--air, ocean, and land surfaces--forms a complex system that has the capacity to keep the Earth a fit place for life. Includes a new Preface by the author. 8 line drawings. In this classic work that continues...

At the conclusion of The Mark of Athena, Annabeth and Percy tumble into a pit leading stragith 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 Door 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 from both sides and prevent the giants from raising...