"Cyrus and Antigone must track down Phoenix and the Dragon's Tooth while facing a threat from the transmortals"--

Sixteen-year-old Hope Walton travels back in time to help rescue her mother, a member of the secret society of time travelers, who is trapped in twelfth-century England in the age of Eleanor of Aquitaine.

Dorrie and her brother Marcus accidently open a portal to Petrarch's Library, where they discover a secret society of warrior librarians who travel in time, protecting the world's greatest thinkers from torture and death for sharing knowledge and ideas.

Noah, Megan, Richie, and Ella must navigate a maze of never-ending aquariums in the Secret Zoo to rescue their animal friends.

Eleven-year-old orphan Tommy Learner's world in 1900 New York City collides with that of twelve-year-old, modern-day Jezebel Lemon in the basement of her apartment building, where together they must use the portals between worlds to thwart the Dead Gentleman, a legendary villain whose last unconquered world is the planet Earth.

"On Halloween night, the scouts, along with their Descender allies, must battle terrifying sasquatches at their own elementary school. Little do they know, the sasquatches are merely the bait to a trap. DeGraff captures three of the Descenders and drags them into a frightening, off-limits sector of The Secret Zoo. Meanwhile, Noah and his friends must protect two of their animals allies from police officers who are convinced that they are dangerous...

It is bad times at Monster High because a secret organization of older monsters is determined to preserve their hierarchy, and it is up to the ghoulfriends -- Rochelle, Rebecca, and Venus -- to stop ASOME, protect their school, and rescue their friends.

"Steeped in Hispanic folklore since childhood, middle schooler Charlie Hernández learns the stories are true when, shortly after his parents disappearance, he grows horns and feathers and finds himself at the heart of a battle to save the world."--Colophon.

Having discovered a magical society beneath the exhibits at the Clarksville City Zoo where animals and humans live harmoniously together as equals, Noah and his friends must protect the secret zoo at all costs.

In 1665 London, fourteen-year-old Christopher Rowe, apprentice to an apothecary, and his best friend, Tom, try to uncover the truth behind a mysterious cult, following a trail of puzzles, codes, pranks, and danger toward an unearthly secret with the power to tear the world apart.