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.
It belongs to my daughter, Lucy.
.إنه ملك لابنتي لوسي
Er gehört meiner Tochter, Lucy.
Elle appartient à ma fille Lucy.
Ele pertence à minha filha, Lucy.
Оно принадлежит моей дочери.
 Её зовут Люси, если не верите.