Campion took another look at the ventilator and wished he might see the body.
A few minutes later he was examining the door of the room and had just decided that at no time had the lock been forced or picked when the pattering feet returned, this time from the courtyard. There was a rush of bitter air as the door swung open and next moment somebody paused and looked in at him.
Mr. Rigget and Mr. Campion exchanged glances.
For some seconds Mr. Rigget hesitated, torn between a desire to see what was going on upstairs and an inclination to investigate Mr. Campion’s unexpected presence. He took stock of the stranger carefully, his eyes round and excited behind his glittering pince-nez.
He decided almost immediately that Mr. Campion was not a detective. Mr. Rigget’s knowledge of detectives
