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.
Then we'll have to settle this right away,
to ensure that doesn't happen.
.علينا حلّ هذه المشكلة على الفور لمنع حدوث ذلك
Dann sollten wir das schnell erledigen,
damit es nicht so weit kommt.
Entonces hay que resolverlo de inmediato
Réglons ça en vitesse
pour éviter d’en arriver là.
Então vamos solucionar o caso de uma vez,
para que isso não aconteça.
Да, печальная участь.
 Так что давай заканчивать побыстрее.