The Turin Shroud (the Sherlock Holmes Easter Special, Episode 3)

Having finally discovered a new lead, Holmes and Watson learned that one of the pastors had a secret lover. Unfortunately, this glimmer of hope soon proved to be another dead end. There was still no new evidence to indicate whether any of the discovered shrouds was the original or if they were all merely copies. Thus, Holmes decided to employ an interrogation method that would surpass anything previously attempted...