Mark Ryan describes how Tommy made an incredible escape from Denmark in a battered old Hornet Moth aircraft - which he had to refuel in mid-air by climbing out on the wing. Later, he escaped from Denmark again - by walking across a treacherous frozen sea on which two of his companions died. Tommy brought over precious intelligence about the Nazi radar installations in Denmark and their atom bomb - his reward was to be imprisoned in Brixton as a suspected double agent and threatened with execution.