Percy Jackson and the Olympians, Book One The Lightning Thief is the first book in the popular fantasy series by Rick Riordan. The book follows the adventures of Percy Jackson, a young boy who discovers that he is a demigod, the son of Poseidon. Along with his friends Annabeth Chase and Grover Underwood, Percy embarks on a quest to find Zeus's stolen lightning bolt and clear his name. This action-packed book is perfect for fans of fantasy and adventure, and is sure to keep readers on the edge of their seats from beginning to end.