The main conflict is that Thalia's three is poisoned, and they need to get the Golden Fleece to prevent it from dying and weaken the camp boarders. They are also saving Grover, wich is trapped on Polyfemus's island.
The conflict starts with Grover getting trapped in the sea of monsters(the Bermuda triangle). Percy, Annebeth, and Tyson(also Percy's step brother) Go and save Grover, but have to battle a Cyclops....
Book 1: Percy's mom gets kidnapped by a giant cow-man (the Minotaur), he turns out to be Posiedon's son, and he has to get Zeus's lightning bolt back before the two gods go to war. Book 2: Camp's...