“I don’t want to hear about Mr. Kuyper Lawton’s diseases. I——”

“My dear fellow! But that is the whole case. Mr. Kuyper-Lawton is undoubtedly a man of great ability. But there was always a cachexis of the thyroid gland. This caused a certain mental instability. Unsound judgment. Violence of temper. It’s quite common.”

“Is it though?” said Lomas. “And why was he violent to poor Wilton?”

“Well, Lawton got clean away after his bank frauds, as you know——”

“I know all about Lawton. He lived on the plunder in Holland as Adrian Hotten and flourished till the war. Then he lost most of his money backing Germany to win. In the end of 1917 he went off to Russia. This year he turned up in London as Julius Kuyper, talking about Russian finance and selling Russian jewels.”

“Quite so. Well, in February he was in a motor accident in Cavendish Square. A lorry hit his car and he was thrown out and stunned. The unfortunate Wilton was passing and gave him first-aid, and discovered that his heart was on the wrong side. He came to under Wilton’s hands. I suppose Wilton showed a little too much interest. Anyhow, Mr. Kuyper saw that the malformation which would identify him with Lawton of the bank frauds was known to the young doctor. Well, he kept his head then. He was very grateful. He asked for Wilton’s card. And Wilton never heard any more of him. But Wilton was interested in this striking case of heterotaxy. He noted the number of the car, found the garage from which it was hired and went round to ask who the man was. They wouldn’t tell him, but the chauffeur, I suppose, told Mr. Kuyper the doctor was asking after him. He sent Witt to take a flat over Wilton’s and find out what Wilton was up to. I take it Mr. Kuyper was doing mighty good business in London and didn’t want to run away. He needn’t have bothered—but that’s the man all over, brilliantly ingenious and no judgment. That thyroid of his! Wilton had come to know the local detective-inspector, that poor chap who committed suicide. I’m mighty sorry for that fellow, Lomas. He was so keen against Wilton because he was afraid of not doing his duty when he liked the man—and then he found he’d blundered into giving false evidence against his friend. I don’t wonder he chose to die.”

“Conscience makes fools of us all,” said Lomas.

“Yes. Yes. Poor beggar. And no wonder Wilton was bitter against him. Well, Kuyper decided that Wilton with his curiosity and his friend in the police wasn’t safe at large. First they tried to ship him out of the country and he wouldn’t go. So they put up the burglary. I suppose Witt or Witt’s friend the sham Dutch journalist is a Hun. That accounts for the Rauch-tabak and the German keys.”

“Lawton-Kuyper has done a lot of business with Germany himself.”

“Yes. He ought to have been on the great General Staff. The right type of mind. One of our native Prussians. An able man—a very able man. If his thyroid had been healthy!”