Franz Xaver Freiherr von Werra was a German World War II fighter pilot and flying ace who was shot down over Britain and captured. He was the only Axis prisoner of war to escape from Canadian custody and return to Germany apart from a U-boat seaman, Walter Kurt Reich, said to have jumped from a Polish troopship into the St. Lawrence River in July 1940. Werra managed to return to Germany via the US, Mexico, South America and Spain, finally reaching Germany on 18 April 1941.

The One That Got Away is a war film. It was produced in United Kingdom. The film was biographical. It was starring Hardy Krüger and featuring Michael Goodliffe, Jack Gwillim and Alec McCowen. The film was directed by Roy Ward Baker. The screenplay written by Howard Clewes. It was based on the 1956 book of the same name. The book was written by Kendal Burt and James Leasor.