Tag the owl, Skyla the squirrel, and Blaze the newly hatched firehawk journey north to the Crystal Caverns, searching for the next piece of the magical Ember Stone--but the evil vulture Thorn is also after the stone, and his ice leopards are close behind the heroes.

"Allison and Max must team up to find his missing uncle Nicholas. Using the journal his beloved uncle left behind as a guide, the duo hurtle headlong into a treacherous and unknown landscape called the Nether. There, they meet a strange girl named Freya and her woefully unheroic wolf, Bunny Biter, who agree to help them in their quest. The group must take on dangerous new foes and unravel the cryptic journal to find Nicholas and reunite this fractured...

This time the mysterious box that Ranger the Golden retriever found transports him to a Maryland plantation before the Civil War, where he must help a young house slave named Sarah and her younger brother Jesse find their way to the underground railroad and North to freedom, before Jesse is sold to a plantation further South.

"With their last adventure just barely over, the Walker kids thought life would finally go back to normal. But things don’t remain calm for long... especially when the colossus Fat Jagger turns up in San Francisco Bay--and he’s in danger! With the police closing in, the Walkers must figure out how to save their giant friend. When a frost beast is spotted in Santa Rosa--and more mystical creatures start appearing all over America--it’s soon clear...