Tunnels volume 4
IL: MG - BL: 6.6 - AR Pts: 22
Will Burrows believes he is safe at the very center of the earth, in a world that no one knows exists, but the Styx are close behind and will follow him anywhere, while on the surface, Drake and some unlikely allies unearth some critical secrets.
Tunnels volume 5
IL: MG - BL: 6.5 - AR Pts: 18
The outer crust is under attack by the subterranean Styx who are turning ordinary humans into walking bombs and incubators for their eggs, and only Will Burrows and his band of retired commandos stand in their way--but the Styx also have problems of their own.