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.
Was that man just now the formidable
mastermind that you mentioned?
هل كان ذلك الشخص هو العقل المدبّر الذي ذكرته؟
War der Kerl vorhin der Drahtzieher,
von dem Sie sprachen?
¿Ese hombre era la mente
maestra que mencionaste?
Tu crois que c’était
la tête pensante dont tu parlais ?
Aquele homem era o formidável
mentor que você mencionou?
Этот, который удрал,
 и есть хитроумный серый кардинал?