"The Steel Key" looks like an early try-out for "The Saint" TV series.
Terence Morgan plays an attractive rogue that police forces around the world would love to catch red-handed; and yet he is happily focused on bringing real criminals to justice.
The "steel key" is a military secret - a "Macguffin" that matters not one jot. The baddies want it - Terence Morgan's character (who uses three different names during the film) gets involved by pretending to have it.
Forsythe, the policeman, is Chief Inspector Teal by another name. And Joan Rice is absolutely charming in the love interest role.
Good fun - with nice views of Fifties Newhaven.