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Series
8 books in the catalogue

Book 1
Tunnels
Roderick Gordon, Brian Williams
Book 3
Freefall
Brian Williams, Roderick Gordon

Book 4
Closer
Roderick Gordon, Brian Williams

Book 5
Spiral
Roderick Gordon, Brian Williams
Tunnels (Tunnels #1)
Brian Williams, Roderick Gordon

Deeper
Roderick Gordon, Brian Williams

Closer
Roderick Gordon

Spiral
Roderick Gordon, Brian Williams
Book data and covers from Open Library (openlibrary.org).