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Fourteen-year-old Andrea travels once again to Moose Jaw, where she and her diabetic younger brother Tony soon get stuck in the perilous past in the now dangerous tunnels with Beanie, Vance and a g

Andrea Talbot and her brother Tony take one more trip through time - Back in the tunnels, they have to solve a mystery that has troubled Grandpa Vance throughout his life: How did his friend Jack

Andrea and her brother travel back to the most dangerous part of her grandfather's past, in Chicago.

Danny wants to be a farmer. He only wishes that the town bully, Zach, would leave him alone. Is there any way Danny can protect himself?

Fifteen-year-old Andrea and her ten-year-old brother Tony are drawn into the scary underground of 1920s Moose Jaw to rescue their friends from Mean-Eyed Max and his gang.

As Will Burrows continues to search for his lost archaeologist father in the strange underground world he has discovered, he stumbles across a sinister plot with terrible implications for the world

As fourteen-year-old archaeologist Will and his friends plummet down a subterranean pore, they face deadly creatures and discover a strange fungal shelf, which not only reveals artifacts from ancie

When Will Burrows and his friend Chester embark on a quest to find Will's archaeologist father, who has inexplicably disappeared, they are led to a labyrinthine world underneath London, full of sin

Will Burrows believes he is safe at the very center of the earth, in a world that no one knows exists, but the Styx are close behind and will follow him anywhere, while on the surface, Drake and so

The outer crust is under attack by the subterranean Styx who are turning ordinary humans into walking bombs and incubators for their eggs, and only Will Burrows and his band of retired commandos st