Rick Riordan

The fifth and final book in the bestselling spin off series from Percy Jackson and the Olympians, featuring the original hero - now in a brand-new look!Seven Heroes. One Prophecy. Destiny Calls. Percy, Annabeth and their friends have survived countless deadly quests and now they must face their greatest challenge yet.stopping the earth mother, and primordial goddess, Gaea - and confronting the terrifying prophecy that binds them all.
But Gaea's giants have risen - all of them - and they're stronger than ever. Now the seven demigods are all that stand in the way of the evil goddess and the destruction of their world. And if that wasn't enough, a terrible sacrifice awaits them.