Yuukoku no Moriarty - Season 1 Episode 9 -
A Study in "S", Act 2
Searching for the true killer of Count Drebber, Sherlock and John set a trap for the culprit using a wedding ring found at the murder scene as bait. After a struggle in which the ring is lost, Sherlock is able to deduce who the real killer is.
Please explain the problem in a few words.
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Max 255 characters.