●Percy Jackson’s seventh-grade year has been surprisingly quiet. Not a single monster has set foot on his New York prep school campus. But when an innocent game of dodgeball among Percy and his classmates turns into a death match against an ugly gang of cannibal giants, things get... well, ugly.

●And the unexpected arrival of Percy’s friend Annabeth brings more bad news: the magical borders that protect Camp Half-Blood have been poisoned by a mysterious enemy, and unless a cure is found, the only safe haven for demigods will be destroyed.

波西傑克森的七年級生活意外過了一段平靜的日子，沒有任何怪物到紐約寄宿學校校園搗亂。一場原本應該平靜的躲避球遊戲到最後變成一場波西和和同班同學對抗食人巨獸的死亡遊戲。

波西的朋友安娜貝斯意外出現卻帶來更糟的消息：守護混血營的的保護屏障竟然被敵人下了毒。只有找到解決辦法，才能保住這半人半神的天堂。