Greyland: D.U.M.B.s (Deep Underground Military Bases) - Book 1
2014
Rescueplan: D.U.M.B.s (Deep Underground Military Bases) - Book 3
2014
Oceandeep: D.U.M.B.s (Deep Underground Military Bases) - Book 2
2014
Simpson: D.U.M.B.s (Deep Underground Military Bases) - Prequel
2025
Threat Display
2021
Purifier: D.U.M.B.s (Deep Underground Military Bases) - Book 7
2020