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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
Spiral
Closer
Freefall
Deeper
Tunnels

Recommended Reading Order

  1. Tunnels

    • 464 pages
    • 17 hours of reading

    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?

    Tunnels1
    3.7

  2. Deeper

    • 659 pages
    • 24 hours of reading

    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 …

    Deeper2
    4.0

  3. Freefall

    • 577 pages
    • 21 hours of reading

    The third installment of the globally successful series about the underground world arrives! The journey to the center of the Earth and the garden of the second sun continues! The story begins immediately after Cal's death and after Will, Chester, and Elliott have fallen into a massive chasm called the Abyss. Remarkably, they survive the long fall into the planet's depths and find themselves in a dangerous world inhabited by unseen predatory creatures. There, they encounter an unexpected ally, but they also face a threat in the form of a vial containing a deadly virus, Dominium, intended to exterminate Earthlings. Can Will and his friends avert this danger? Will he finally find his father? Answers to these and many other questions can be found in the third installment of the Underground series titled Freefall in the Underground!

    Freefall3
    4.1

  4. Closer

    • 508 pages
    • 18 hours of reading

    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?

    Closer4
    4.1

  5. Spiral

    • 425 pages
    • 15 hours of reading

    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.

    Spiral5
    4.1

  6. Terminal

    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 ...

    Terminal6
    3.7