The classic first book about Percy Jackson, the troubled boy who discovers he is the son of Poseidon, and his adventures with demigods, monsters, and Greek gods. This classic by number one New York Times bestselling author Rick Riordan has sold millions of copies throughout the world. It has appeared on the New York Times bestseller list for more than 10 years and is read in classrooms across the US. Adapted into a movie, a Broadway musical, and soon, a TV series on Disney, it brings Greek mythology to life for modern readers.

The book features beloved characters such as Annabeth Chase and Grover the satyr. It is funny and fast-paced. Percy Jackson is a good kid, but he can't seem to focus on his schoolwork or control his temper. Lately, being away at boarding school is only getting worse—Percy could have sworn his pre-algebra teacher turned into a monster and tried to kill him. When Percy's mom finds out, she knows it's time for him to learn the truth about where he came from and that he needs to go to the one place he'll be safe. She sends Percy to Camp Half-Blood, a summer camp for demigods, where he learns that the father he never knew is Poseidon, god of the sea.

Soon a mystery unfolds, and together with his friends—one a satyr and the other the demigod daughter of Athena—Percy sets out on a quest across the United States to reach the gates of the Underworld and prevent a catastrophic war between the gods.