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.
So in that case, the true killer is...
...في تلك الحالة، القاتل الحقيقيّ هو
Dann ist der wahre Täter also …
Entonces, en ese caso,
el verdadero asesino es…
Alors, le meurtrier du comte est…
Então, nesse caso, o assassino é...
Получается, истинный преступник...