Jason, Piper, and Leo, three students from a school for "bad kids," find themselves at Camp Half-Blood, where they learn that they are demigods and begin a quest to free Hera, who has been imprisoned by Mother Earth herself.

For seven years, bad luck has followed Ivy around like a dog on a leash. Her father disappeared, her mother is a washed–up beauty–pageant winner, and now Viola and her mother have moved into a ramshackle house on Gumm Street. Ivy's new neighbors–bookish Pru, stuck–up Cat, and wannabe adventurer Franny–are worse than unfriendly. But then a mysterious pair of ruby red slippers turn up, and the four girls are swept away... not to OZ, but to...