“Then,” he continued, “just as I thought I'd fixed everything neatly, this creature Whalley descended on me. He'd taken the number of my car at the gate and faked up a yarn about an accident, so that he could get me identified for him. He called on me and started blackmail. I paid him, of course, to keep him quiet. But naturally I couldn't let him stand in my way after all I'd gone through safely. He wasn't a very valuable life at the best, I gather.
“Anyhow, I got him up here one night—my housekeeper was still away—and throttled him without too much trouble. Then I took the body down into the garage, put it into my car, and drove out the Lizardbridge Road a bit before tipping him into the ditch. I left the tourniquet beside his body. It was a specially-contrived one, meant to throw some more suspicion on Silverdale. I forgot to say that I borrowed Silverdale's lab. coat to wear during the operation, in case of there being any blood. And I tore off a button and left it in Whalley's hand. Then I put the torn jacket back on Silverdale's peg, ready for the police.
“Naturally I was quite pleased to hear that Silverdale had been arrested. That was his look-out, after all. And he seemed to be in trouble over an alibi, which was better news still. The next thing was to clinch the business, if possible.
“I've told you that once upon a time I played some parts in an amateur dramatic show. I was really not bad. And it struck me, after I'd seen you once or twice, Sir Clinton, that I could make myself up into a very fair copy of you. We're about the same height to start with. I wouldn't have risked it with anyone who knew both of us; but I'd learned that Avice Deepcar was out of town, and I thought I could manage to take in her maid easily enough.
“So I raided her place, posing as Sir Clinton Driffield—I'd had some notion of the sort in my mind for a while and had cards printed in London all ready: one of these print-’em-while-you-wait places which left no traces behind in the way of an address or an account. In my raid, I got a valuable document.”
“It was a clever enough fake, Dr. Markfield,” Sir Clinton said reflectively. “But you left one or two things in it that we took hold of easily enough. By the way, I suppose you simply traced Mrs. Silverdale's writing from some old letters when you put the faked address on the code advertisements you sent to the newspapers?”
Markfield nodded.
“You don’t seem to have missed much,” he admitted.
He rose slowly to his feet and put down his pipe.
“I think that's the whole story,” he said indifferently. “If you've got it all down now, Inspector, I'll sign it and initial it for you. Then I suppose it'll be a case of ringing up the Black Maria or something like that.”