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.

The Tuck family is confronted with an agonizing situation when they discover that a ten-year-old girl and a malicious stranger now share their secret about a spring whose water prevents one from ever growing any older.

Cass's mom is kidnapped by the evil dessert chef, Señor Hugo, who requests the legendary tuning fork as ransom, leading Cass and Max-Ernest to try finding the magical instrument in time.

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.

Agreeing to join the mysterious Kian's magical faction to exact revenge on a group of bullies who have tormented her, Edie transforms into a beautiful girl and begins to sabotage the bullies' inner circle only to discover dark truths about Kian's world.

Kelsey returns home to Oregon, where Mr. Kadam has enrolled her in college, but danger sends her back to India to begin another quest, this time with Kishan, to try to break the curse that forces Kisham and his brother Ren to live as tigers.

The soul that Renée and Dante share cannot sustain them both but Renée may hold the secret of eternal life which they must keep safe from the Liberum and a team of Monitors as they cross Europe seeking the Netherworld, a legendary chasm where souls go to be cleansed.