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, he stumbles across a styx plot with terrible implications for the world above. And a sister who isn't finished yet... 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, he stumbles across a styx plot with terrible implications for the world above. And a sister who isn't finished yet...