When Sherlock Holmes goes in to Dr Roylott’s room, he observes that it is very sparsely furnished.
A camp-bed, a small wooden shelf full of books, mostly of a technical character, an armchair beside the bed, a plain wooden chair against the wall, a round table, and a large iron safe were the principal things which met the eye.
Holmes is suspicious of the locked safe in the bedroom. The first strange item is a saucer of milk placed next to the safe. The second item is a dog leash at the end of the Doctor’s bed. It is unusual in the way in which it is coiled –
The lash, however, was curled upon itself and tied so as to make a loop of whipcord.
When searching Miss Stoner's room, he is suspicious of the dummy bell pull, and the fact that the bed is secured to the floor.