HÉROES DEL OLIMPO 1. EL HÉROE PERDIDO

When Jason wakes up, he knows something is terribly wrong. He is on a bus
on his way to a camp for troubled kids. And he is accompanied by Piper
—a girl (quite pretty, by the way) who says she is his girlfriend— and
the one who seems to be his best friend, Leo…

But he remembers nothing: neither who he is nor how he got there.

A few hours later, the three will discover not only that they are children of
Olympian gods but that their destiny is to fulfill a crazy prophecy:
to free Hera, goddess of fury, from the clutches of an enemy who has
been planning his revenge for a long time…

“With all the usual action, wit, and heart of Riordan.”
Publisher's Weekly