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 he's setting a trap.
.قام بنصب فخّ
Sie stellen uns also eine Falle.
Nos está tendiendo una trampa.
Ils nous tendent un piège.
Então ele armou uma emboscada.
Он устроил нам ловушку.