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.
This is why I have given
my life to my benefactor.
.لهذا السبب وضعت حياتي بين يديّ محسني
Aus diesem Grund habe ich
ihm mein Leben dargeboten.
Por eso le he ofrecido
mi vida a mi benefactor.
C’est pour ça que j’ai offert ma vie
à mon bienfaiteur.
Por isso, dei minha
vida ao meu benfeitor.
Поэтому я предложил
 свою жизнь тому господину.