The Son of Neptune (The Heroes of Olympus 2)

Three friends. One crazy mission. And an enemy with superhuman powers.

What games do the gods of Olympus play?

Gaea, Mother Earth, is awakening an army of monsters to destroy humanity... and they entertain themselves by confusing the demigods, the only ones who can defeat their wicked plans.

Now they have sent Percy to Camp Jupiter almost without memories and with the unsettling feeling that he, the Greek, is the enemy. Luckily, he will have the support of Hazel, a girl born more than eighty years ago, and Frank, a boy who still doesn't quite know what his powers are (or if he has any).

Together they must embark on a dangerous expedition to free Thanatos, the god of death, from the clutches of a giant...