Visiting her grandmother in Australia, Livy, ten, is reminded of the promise she made five years before to Bob, a strange, green creature who cannot recall who or what he is.

Matt Cruse, a student at the Airship Academy, and Kate de Vries, a young heiress, team up with a gypsy and a daring captain, to find a long-lost airship, rumored to carry a treasure beyond imagination

After a fire kills her parents, eleven-year-old Martine must leave England to live with her grandmother on a wildlife game reserve in South Africa, where she befriends a mythical white giraffe

Matt, a young cabin boy aboard an airship, and Kate, a wealthy young girl traveling with her chaperone, team up to search for the existence of mysterious winged creatures reportedly living hundreds of feet above the Earth's surface

Ash Tyler hopes to make his psychologically scarred father proud by training for his town's Stag Chase, but when he meets the mysterious Bone Jack, dark energies take root and the world as he knows it is upended.

Destined to take over his family farm in Norrøngard, Karn would rather play the board game, Thrones and Bones, until half-human, half frost giantess Thianna appears and they set out on an adventure, chased by a dragon, undead warriors, an evil uncle, and more.

While the Olympians struggle to contain the rampaging monster Typhon, Kronos begins his advance on New York City, where Mount Olympus stands virtually unguarded. Now it's up to Percy Jackson and an army of young demigods to stop the Lord of Time

A trilogy conclusion finds Byx and her friends discovering that the same extinction facing the dairnes is threatening all living species, prompting the team to recruit creatures throughout the world into their revolution.

When the goddess Artemis goes missing, she is believed to have been kidnapped. And now it's up to Percy and his friends to find out what happened. Who is powerful enough to kidnap a goddess? They must find Artemis before the winter solstice, when her influence on the Olympian Council could swing an important vote on the war with the titans. Not only that, but first Percy will have to solve the mystery of a rare monster that Artemis was hunting when...

Seth, Kendra, and their friends and allies make their last stand against the dragon army at the hidden Kingdom of Selona, hoping the legendary dragon slayers will arise and ancient powers will awaken.