Brian James Williams Book order (chronological)

After Deeper, can the Tunnels adventure be any more dangerous? And where will it end? Will Burrows and his gang are far from finished as they free-fall down a subterranean pore. As they experience reduced gravity, the dark mysteries of the deep unfold and they discover a strange fungal shelf, which not only reveals artifacts from ancient civilisations, but clues to a lost land at the end of the Earth. This title is the third in the thrilling "Tunnels" series - an international publishing sensation.

The Tunnels adventure is far from over for Will Burrows.In his quest to find his father, Will is plunged even deeper underground. And as if things weren't bad enough already in the heat and darkness, he stumbles across a Styx plot with terrible implications for the world above - and a sister who isn’t finished yet …

14-year-old Will Burrows has little in common with his strange, dysfunctional family. In fact, the only bond he shares with his eccentric father is a passion for archaeological excavation. So when his dad mysteriously vanishes, Will is compelled to dig up the truth behind his disappearance. He unearths the unbelievable: a subterranean society that time forgot. "The Colony" has existed unchanged for a century, but it's no benign time capsule of a bygone era. Because the Colony is ruled by a merciless overclass, the Styx. Will must free his father--is he also about to ignite a revolution?