Percy's seventh year at school is going somewhat smoothly - somewhat. If it weren't for these nightmares in which his best friend is in danger. And indeed: Grover is in the clutches of a Cyclops. To make matters worse, Camp Half-Blood is no longer safe: Someone has poisoned the tree of Thalia, which has protected the borders of this magical place until now. Only the golden fleece can help. Carlsen continues the successful comic adaptation of Rick Riordan's bestseller in time for the movie release.