The movie

This is a kind of a spoiler so... yeah read if you want! :)

The movie Percy Jackson and the Olympians The lighting Thief has nothing to do with the book series but it is still a okay movie. The movie is about the same characters but has a totally different plot. In the book they get a quest and get a gift of three pearls to get back from the underworld (but with out his mother.) go get the lighting bolt and bring it back to Zeus and his mom is brought back by Percy's father. In the movie they do not get a quest they the seek out the three pearls to bring the mom back and they find the lighting bolt along the way. As you can see (read) the two plots are totally different. But the movie is still good so i would suggest watching it.
I did some reason because i am an obsessed fan :) and found out that the next movie they do will be coming out next year after they finish  The perks of a wall flower so the actors can all come back and they have a new directer and a new writer so the movie will actually follow the book.