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Underworld Series

This series plunges readers into a thrilling world of mystery and danger hidden deep beneath the earth's surface. Follow the journeys of young protagonists as they uncover incredible labyrinths and confront perilous challenges. It's a tale of courage, friendship, and the revelation of hidden truths that will keep you on the edge of your seat. Dive into an adventure that tests both their strength and their wit.

Terminal
Tunnels
Deeper
Closer
Freefall
Spiral

Recommended Reading Order

  1. 1

    Tunnels

    • 464 pages
    • 17 hours of reading
    3.7(59935)Add rating

    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?

    Tunnels
  2. 2

    Deeper

    4.0(23997)Add rating

    The New York Times bestselling, action-packed sequel to the "underground" sensation TUNNELS! Wandering the dark, dry warrens beneath the Colony with his best friend, Chester, and his brother, Cal, boy archaeologist Will Burrows stumbles across the Styx's dastardly plan to enslave all Topsoilers by unleashing Dominion-a debilitating viral weapon. But before Will can put a stop to the plot, he's got to evade not only a couple of killer Rebecca clones but also a bunch of sharpshooting bounty hunters led by none other than his long-lost biological mother! Where is Will's dad? What's at the bottom of the mysterious Pore? How much lower can they go?!

    Deeper
  3. 3

    Freefall

    4.1(18444)Add rating

    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.

    Freefall
  4. 4

    Closer

    • 508 pages
    • 18 hours of reading
    4.1(4370)Add rating

    At the centre of the Earth, in a world that no one knows exists, Will is in trouble. His enemy, the Styx, are close behind. They'll pursue him to the ends of the world - any world. Meanwhile Drake - with help from the unlikeliest of allies is preparing to fight the Styx from above. But will his daring plan bring him closer to victory ...or to certain death?

    Closer
  5. 5

    Spiral

    • 425 pages
    • 15 hours of reading
    4.1(3155)Add rating

    In the fifth and penultimate book in the Tunnels series, The Styx have surfaced. If you thought the Limiters were nasty, think again. They've brought their females with them this time. And all that stands in their way are Will and his friends, and a rag-bag team of retired commandos. It's a smoking spiral of chaos and not everyone is going to survive. Highly-anticipated fifth book in the internationally bestselling Tunnels series.

    Spiral
  6. 6

    Terminal

    3.7(518)Add rating

    The Styx are sweeping across England, leaving death and devastation in their wake. It seems nothing can stop them now. But, deep in the centre of the earth, Will and Elliott must find a way ...

    Terminal