When a mummy disappears from the local history museum while Cass and her friends Max-Ernest and Yo-Yoji are there, they try to solve the case in order to clear their names and, they hope, discover the Secret they have been seeking.

Two eleven-year-old misfits try to solve the mystery of a dead magician and stop the evil Dr. L and Ms. Mauvais, who are searching for the secret of immortality.

When twelve-year old Ivy attends West Archer Academy, she is determined to graduate in two years and eventually follow her hero Ruth Bader Ginsberg to the Supreme Court, but after her roommate introduces her to a group of students who are hundreds of years old, she is forced to reexamine her priorities.

The Pandavas call on old friends, make new allies, and face fearsome trials as they embark on a mission to stop the Sleeper from accessing the nectar of immortality, but ultimately Aru must decide who deserves immortality--the devas or the asuras--and an unexpected answer comes from an unexpected place.