For years, a blackmailer has been preying on the weaknesses of others throughout London. When Holmes hears of the utter misery this mystery man is creating, he adopts a campaign to thwart his evil scheming. The campaign astonishes Dr. Watson by its strangeness and finds Holmes falling in love.

• Granada Television
• GBH
• Jeremy Brett
• Edward Hardwicke
• Robert Hardy
• Norma West
• Gwen Ffrangcon Davies
• Colin Jeavons
• Serena Gordon
• Rosalie Williams