Closer

BOOK FOUR IN THE HUGELY SUCCESSFUL TUNNELS SERIES BY RODERICK GORDON AND  BRIAN WILLIAMS

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?