The New York Times best-selling Tunnels series continues with this fifth installment from acclaimed authors Roderick Gordon and Brian Williams. In Spiral, horror spreads across England in the form of the Styx, malevolent creatures carrying a dark secret that could spell doom for all Topsoilers. All is not lost, however. Will Burrows and a small band of former commandos vow to stomp out the threat-even if it means placing their lives in mortal danger.