The Rivals of Sherlock Holmes
Diamond merchant Leon Bouvier possesses the Mirror of Portugal, but his brother Jacques believes it should be his. Jacques arranges for private agent Horace Dorrington (Peter Vaughan) to steal it, but Dorrington wants the diamond for himself. After Leon is robbed, he calls in Dorrington himself to investigate the case.
Martin Hewitt is on the hunt for a trusted clerk who absconded with 15,000 pounds.
Private detective Sutton (Robert Lang) follows a trail of stolen jewelry and murder.
Romney Pringle (Donald Sinden), a con man at heart, investigates the Assyrian Rejuvenator.
