In an alternate 1914 Europe, fifteen-year-old Austrian Prince Alek, on the run from the Clanker Powers who are attempting to take over the globe using mechanical machinery, forms an uneasy alliance with Deryn who, disguised as a boy to join the British Air Service, is learning to fly genetically-engineered beasts.

Crusty dragon Miss Drake's new pet human, precocious ten-year-old Winnie, not only thinks Miss Drake is her pet, she accidentally brings to life her "sketchlings" of mysterious and fantastic creatures hidden in San Francisco, causing mayhem among its residents.

Imaginative and adventurous Katrina eludes her maniacal guardian to help Morty, a member of a vanishing breed of zorgles, with his quest to uncover the fate of the fabled zorgles of Zorgmazoo as well as of other creatures that seem to have disappeared from the Earth.

To save an injured flying horse, eight-year-old Maggie must journey through the Enchanted Forest, which is full of dangerous trolls and goblins, to find a kindly stableman named Bob, who cares for many different magical animals.

"Nick, Carter, and Angelo bring their monster expertise on a camping trip to the woods, where they accidentally unleash creatures that have the power to copy human appearance exactly"--

"Ten-year-olds Pearl and Ben continue their apprenticeships at Dr. Woo's Worm Hospital as they travel with Dr. Woo to the Tangled Forest and the Dark Forest in search of a missing unicorn, and learn more about the villainous Maximus Steele"--

"Ten-year-olds Pearl and Ben find excitement in the small town of Buttonville as they encounter otherworldly animals, including a lake monster, during their first official day as apprentices to Dr. Woo, a veterinarian for Imaginary Creatures"

Saved from bullies by the class misfit, Nick, Frank is drawn to Nick's house by strange music, discovers he has incredible secrets that bring danger, and decides to help him as he helped her.

The thing about Hank's new friend Inkling is, he's invisible. No, "not" imaginary. Inkling is an invisible bandapat, a creature native to the Peruvian Woods of Mystery. (Or maybe it is the Ukrainian glaciers. Inkling hardly ever gets his stories straight.) Now Inkling has found his way into Hank's apartment on his quest for squash, a bandapat favorite. But Hank has bigger problems than helping Inkling fend off maniac doggies and searching for pumpkins:...

While fifteen-year-old Ellie tries to find her missing eleven-year-old brother, Danny, in alternating chapters Danny dreams of a parallel quest in a fantasy world of dragons and shapeshifters that he and Ellie knew as children.