“Now then, Mr. Copperdock,” he said. “Tell me exactly what happened yesterday evening.”

The tobacconist immediately launched into an account of his adventure. Whyland listened patiently, occasionally making a brief note with the pen. “You say that nobody could have entered the house while you were out?” he asked, as Mr. Copperdock came to the end of his story.

“Quite impossible,” replied Mr. Copperdock emphatically. “There’s only one door, with a spring lock which catches when you shuts it.”

“H’m. I’d like to have a look round, if you don’t mind,” said the Inspector.

He examined the house carefully. On the ground floor was the shop, and behind it the office and a little kitchen containing a gas stove. The windows of these did not open, and were high up in the wall, and covered with a stout iron grating. There was no back entrance. From a narrow passage a staircase ran up to the first floor, upon which were two bedrooms, occupied respectively by Mr. Copperdock and his son, and a sitting-room. The bedrooms were over the shop, and looked out upon Praed Street. The sitting-room was at the back, and looked out over an enclosed yard, belonging to a transport contractor, and used for storing vans at night. The windows on the first floor were obviously inaccessible without the aid of a ladder. Above the first floor were a couple of attics, lighted only by skylights, which were closed and padlocked. From the cobwebs which covered them, it was obvious that they had not been opened for a long time.

Inspector Whyland returned to the first floor. “Were these windows closed and fastened while you were out last night?” he enquired.

“The sitting-room was,” replied Ted, who had followed them upstairs. “I looked at it when I came in. It hasn’t been touched since.”

Whyland looked at it, and satisfied himself that it showed no signs of having been forced. “What about the bedroom windows?” he asked.

“Both Dad’s and mine were open at the top,” replied Ted. “But nobody could have got in through them, unless they had put up a ladder in the middle of Praed Street.”

“Even the black sailor isn’t likely to have done that,” observed Whyland sarcastically. “Well, Mr. Copperdock, the best advice I can give you is not to go about alone at night too much. I’ll have a man watch outside the premises for a bit, if that’s any comfort to you. But, if you ask me, I don’t think you’re in any immediate danger.”