Mark Fowler Related books Footprint Files Edc Pub • 1997 Logic Puzzles (Usborne Superpuzzles) Edc Pub • 1994 The Crimebusters Investigate (Puzzle Adventure Series) Edc Pub • 1997 The Emerald Conspiracy Edc Pub • 1994 The Emerald Conspiracy (Usborne Puzzle Adventures) Edc Pub • 1989