Inspector Reed sat in his office, studying the reports on the three people who might have stolen the colonel s collection of rare coins.
First, there was Barnes, the man looks after the colonel s property. He had been cheating the colonel for years and besides he was badly in debt. Almost certainly he had a set of keys to the house.
Next, there was the maid. She seemed honest enough herself but the inspector had discovered that she was in love with a man who had spent many years in jail. Perhaps she had let him into the house the night the colonel had been robbed.
Finally, there was the colonel s own son. He had been in trouble even when he was at university. He too was in debt. Besides, he could have entered the library, where the collection was kept, at any time. The inspector decided that he must question him again more carefully.
Just then there was a knock at the door and Sergeant Smith burst in.
"Sir," he announced dramatically, "The girl has admitted everything."