Why were Sherlock Holmes and Dr. Watson at the Crown Inn?

Holmes and Watson went to the inn to watch the activity at the Stoke Moran Manor House across the street.

Sherlock Holmes and I had no difficulty in engaging a bedroom and sitting-room at the Crown Inn. They were on the upper floor, and from our window we could command a view of the avenue gate, and of the inhabited wing of Stoke Moran Manor House.