translation.en: "Well, it was evident from what we have heard that Baskerville has been very closely shadowed by someone since he has been in town. How else could it be known so quickly that it was the Northumberland Hotel which he had chosen?
translation.pl: -- Z tego, com słyszał od Baskervilla, przypuszczam, że od chwili jego przybycia do Londynu ktoś go śledzi, bo inaczej, skądby wiedziano tak szybko, że stanął w hotelu Northumberland?