Deeper

"As Will Burrows continues to search for his lost archaeologist father in the strange underground world he has discovered, he stumbles across a sinister plot with terrible implications for the world above.--"@en
"Sequel to: Tunnels. 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 murderous stepsister who will stop at nothing to find Will. Gripping pageturner."
"As Will Burrows continues to search for his lost archaeologist father in the strange underground world he has discovered, he stumbles across a sinister plot with terrible implications for the world above."@en
"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 murderous stepsister who will stop at nothing to find Will."@en