The doctor stumbles through the door of 221B Baker Street, shaking of rain and mud from his clothes. The man at the armchair gets up and helps him off his coat. The doctor looks gratefully at him and mutters something about finishing his report but the detective gently steers him towards the sofa. The doctor sinks in, obviously relieved at the warmth and comfort.

The notes of Bach stir the still air.

And the doctor is asleep.

Tada! Only one more to go!