John introduces Sherlock to Mary, his fiancée. A stunned Sherlock realizes that Mary has another concern. She produces six pearls, detailing their connection to her missing father. She asks Sherlock to look into the matter, but is holding something back.
"The Sign of Mary"
Das Zeichen der Vier
El signo de Mary
Le signe de Mary
O SINAL DE MARY
Знак четырёх