AllMovie

The Steel Key is a little-known British melodrama with some potent talent involved, including actors Terence Morgan and Joan Rice and future Saint director Robert Baker. The "maguffin" in this film is a formula for processed hardened steel. When the formula is stolen, the evidence points to international espionage. The good guys follow the trail of hot clues and dead bodies to uncover the villains boring from within the British industrial circles. Rarely seen in recent years, The Steel Key made the rounds in the early-TV days when British films were virtually all that was available for the tube.