Martin had gone away with the keys in his pocket. Mr. Houlder had agreed with this theory, and had given Mr. Briggs a duplicate key which he happened to have.

The foreman had called on Mr. Briggs, and had been given the duplicate key. But when he came to try the door, it would not open. He made several attempts but, finding them unavailing, desisted and made his way through a window at the back. He then discovered that the door was bolted on the inside, a circumstance which puzzled him tremendously. Shortly afterwards the electrician arrived, and his thoughts were diverted into other channels.

Inspector Whyland spent a few minutes talking to the foreman, who confirmed the latter part of Houlder’s story, and had barely finished his enquiries when the doctor arrived. The two went down to the cellar together, and the doctor, without wasting words, proceeded to examine the body, Whyland watching him intently.