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.
Given the width of his finger,
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Ausgehend von der Dicke der Finger,
D’après la largeur des doigts…
Devido à espessura do dedo,
Судя по толщине пальцев,