Is There a Ventilator in the Crown Inn?

Sherlock holmes and i had no difficulty in engaging a bedroom and a sitting room at the crown inn. From our window we could command a view of the avenue gate and of the inhabited wing of stokemoran manor house. At dusk, we saw doctor grimsby roylott drive past, his huge form looming up beside the little figure of the lad who drove him. We heard the hoarse roar of the doctor's voice and saw the fury from which he shook his clenched fists at him. A few minutes later we saw a sudden light spring up among the trees as the lamp was lit in one of the sitting rooms. I knew that we would find a ventil