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.

Hazel stands at a crossroads. She and the remaining crew of the Argo II could return home with the Athena Parthenos statue and try to stop Camp Half-Blood and Camp Jupiter from going to war. Or they could continue their quest to find the House of Hades, where they might be able to open the Doors of Death, rescue their friends Percy and Annabeth from Tartarus and prevent monsters from being reincarnated in the mortal world. Whichever road they decide...

Kenzie is so excited by the first day of gymnastics camp that she accidentally breaks the lock on the gym door--will she confess to the damage or let camp be canceled for everybody?

"Lulu is sent to Camp Sisterhood to learn how to be a big sister, but she makes it her mission to be the worst sister-in-training in camp history"--

Unhappy about being sent to the same summer camp after their fathers start dating, Bett and Avery, two girls, age eleven, eventually begin scheming to get the couple back together after a break-up. Told entirely through letters, emails and text messages.

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.