‘Well, it’s like this, sir. I’ve got a young lady, you see, and her mother lets rooms. Up Camden Town way. Their second-floor back has been let for over a year to a man called Cust.’

‘Cust—eh?’

‘That’s right, sir. A sort of middle-aged bloke what’s rather vague and soft—and come down in the world a bit, I should say. Sort of creature who wouldn’t hurt a fly you’d say—and I’d never of dreamed of anything being wrong if it hadn’t been for something rather odd.’

In a somewhat confused manner and repeating himself once or twice, Tom described his encounter with Mr Cust at Euston Station and the incident of the dropped ticket.

‘You see, sir, look at it how you will, it’s funny like. Lily—that’s my young lady, sir—she was quite positive that it was Cheltenham he said, and her mother says the same—says she remembers distinct talking about it the morning he went off. Of course, I didn’t pay much attention to it at the time. Lily—my young lady—said as how she hoped he wouldn’t cop it from this A B C fellow going to Doncaster—and then she says it’s rather a coincidence because he was down Churston way at the time of the last crime. Laughing like, I asks her whether he was at Bexhill the time before, and she says she don’t know where he was, but he was away at the seaside—that she does know. And then I said to her it would be odd if he was the A B C himself and she said poor Mr Cust wouldn’t hurt a fly—and that was all at the time. We didn’t think no more about it. At least, in a sort of way I did, sir, underneath like. I began wondering about this Cust fellow and thinking that, after all, harmless as he seemed, he might be a bit batty.’

Tom took a breath and then went on. Inspector Crome was listening intently now.

‘And then after the Doncaster murder, sir, it was in all the papers that information was wanted as to the whereabouts of a certain A B Case or Cash, and it gave a description that fitted well enough. First evening off I had, I went round to Lily’s and asked her what her Mr Cust’s initials were. She couldn’t remember at first, but her mother did. Said they were A B right enough. Then we got down to it and tried to figure out if Cust had been away at the time of the first murder at Andover. Well, as you know, sir, it isn’t too easy to remember things three months back. We had a job of it, but we got it fixed down in the end, because Mrs Marbury had a brother come from Canada to see her on June 21st. He arrived unexpected like and she wanted to give him a bed, and Lily suggested that as Mr Cust was away Bert Smith might have his bed. But Mrs Marbury wouldn’t agree, because she said it wasn’t acting right by her lodger, and she always liked to act fair and square. But we fixed the date all right because of Bert Smith’s ship docking at Southampton that day.’