That night we went back to the house. When we saw Helen Stoner's light, Holmes and I got in quietly through the window. Then we waited silently in the middle bedroom in the dark. We waited for three hours and did not move. Suddenly we saw a light and heard a sound from Dr Roylott's room. But nothing happened, and again we waited in the dark. Then there was another sound, a very quiet sound… Immediately Holmes jumped up and hit the bell-rope hard.

"Can you see it, Watson?" he shouted. But I saw nothing. There was a quiet whistle. We both looked up at the air-vent, and suddenly we heard a terrible cry in the next room. Then the house was silent again.

"What does it mean?" I asked. My voice was shaking.

…

…

…

 

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