In Mystery on the Moor, part of the Biggles Flies to Work anthology, Leston was one of a trio of criminals who had made a payroll snatch robbery, getting off with over twenty thousand pounds. Together with his accomplices Gunther and Gallinsky, they sought refuge in the Dartmoor farmhouse clinic operated by Doctor Alton Bentworth and Manton Rushling where they were the Doctor's first patients in their joint business of altering the faces and/or fingerprints of criminals to evade the police.

When Biggles and Gaskin raided the Dartmoor farmhouse, Leston, in the midst of plastic surgery, was unable to resist arrest. The loot from the theft was found in the farmhouse and Leston and his accomplices ended up with longer sentences for robbery with violence.

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