Terminal, the sixth and final instalment in the Tunnels series, was published in both the UK and the US in 2013. The Tunnels books feature Will and his friends' continuing fight against a terrifying and brutal subterranean race called the Styx, who want to take control of the surface. If you thought you were safe, you'd better think again.
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And Tunnels, Deeper, Freefall, Closer, Spiral and Terminal can be purchased here: