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Mercury: Angus's pharmacy is broken into, and a bottle of mercuric chloride is stolen. As Janet tries to sniff out the culprit, the doctors discern the reason for the theft: someone suffering from syphilis is attempting to take the outdated-and highly dangerous-mercury cure.

Starring: David Rintoul, Annette Crosbie, Ian Bannen.
US TV RATING: TV-14