“Something of that sort.”

“And now we’ve got to find who killed Maurice Chacewater down there, underground?”

“There’s nothing in that, Inspector. He killed himself. It’s a fairly plain case of suicide.”

“But why did he commit suicide?”

Sir Clinton appeared suddenly smitten with deafness. He ignored the Inspector’s last inquiry completely.

“I shall want you to-night, Inspector. Come to my house at about half-past twelve. And you had better wear rubber-soled boots or tennis shoes if you have them. We’ll go up to Ravensthorpe in my car.”

“You’re going to arrest Marden, sir?”

“No,” was Sir Clinton’s reply, which took the Inspector completely aback. “I’m not going to arrest anybody. I’m going to show you what Foss was going to do with his otophone; that’s all.”

CHAPTER XIII.
The Otophone

Punctually at half-past twelve the Inspector arrived at Sir Clinton’s house. The Chief Constable’s first glance was at the feet of his subordinate.