Percy Jackson's adventures continue! They don't always end in victories; sometimes they also end in troubles. So this time, after another portion of adventures, Percy returns to Camp Half-Blood, and there... Troubles await him in the camp. Thalia's magical tree, in which she is imprisoned the soul of the daughter of Zeus is poisoned, it dies, and yet it was his magic that protected the camp from evil monsters. Moreover, the wise centaur Chiron is slandered and expelled from the camp. Percy has visions from which it becomes clear that in order to save the camp it is necessary to obtain the Golden Fleece, stored on the island of the Cyclops Polyphemus in the Sea of Monsters. And Percy sets off...