"Clara Millen's life is spiraling out of control: her dream job is a nightmare, she's resoundingly single, and it's been years since she's taken some time off. Thankfully, the last problem she can fix--this year she'll join her friends on their annual summer vacation to their beloved childhood sleepover camp for a much-needed escape. But when Clara arrives at Pine Lake Camp, she faces yet another unwelcome change: the owners are retiring and selling...

When summer arrives, Humphrey, the pet hamster of Longfellow School's Room 26, is surprised and pleased to learn that he will be going to Camp Happy Hollow.

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.

Demigod Percy Jackson, still with no memory, and his new friends from Camp Jupiter, Hazel and Frank, go on a quest to free Death, but their bigger task is to unite the Greek and Roman camps so that the Prophecy of Seven can be fulfilled.

"Top-secret training continues into summer for aspiring spy Ben Ripley--and so does the danger"--