Fox met little Mr. Hislop at the door and left him alone with Alleyn. Phillipa had been right, reflected the Inspector, when she said Richard Hislop was not a noticeable man. He was nondescript. Grey eyes, drab hair; rather pale, rather short, rather insignificant; and yet last night there had flashed up between those two the realization of love. Romantic but rum, thought Alleyn.

“Do sit down,” he said. “I want you, if you will, to tell me what happened between you and Mr. Tonks last evening.”

“What happened?”

“Yes. You all dined at eight, I understand. Then you and Mr. Tonks came in here?”

“Yes.”

“What did you do?”

“He dictated several letters.”

“Anything unusual take place?”

“Oh, no.”

“Why did you quarrel?”

“Quarrel!” The quiet voice jumped a tone. “We did not quarrel, Mr. Alleyn.”

“Perhaps that was the wrong word. What upset you?”

“Phillipa has told you?”

“Yes. She was wise to do so. What was the matter, Mr. Hislop?”

“Apart from the… what she told you… Mr. Tonks was a difficult man to please. I often irritated him. I did so last night.”

“In what way?”

“In almost every way. He shouted at me. I was startled and nervous, clumsy with papers, and making mistakes. I wasn’t well. I blundered and then… I… I broke down. I have always irritated him. My very mannerisms—”

“Had he no irritating mannerisms, himself?”

“He! My God!”

“What were they?”

“I can’t think of anything in particular. It doesn’t matter does it?”

“Anything to do with the wireless, for instance?”

There was a short silence.

“No,” said Hislop.

“Was the radio on in here last night, after dinner?”

“For a little while. Not after—after the incident in the hall. At least, I don’t think so. I don’t remember.”

“What did you do after Miss Phillipa and her father had gone upstairs?”

“I followed and listened outside the door for a moment.” He had gone very white and had backed away from the desk.

“And then?”

“I heard someone coming. I remembered Dr. Meadows had told me to ring him up if there was one of the scenes. I returned here and rang him up. He told me to go to my room and listen. If things got any worse I was to telephone again. Otherwise I was to stay in my room. It is next to hers.”

“And you did this?” He nodded. “Could you hear what Mr. Tonks said to her?”

“A — a good deal of it.”

“What did you hear?”

“He insulted her. Mrs. Tonks was there. I was just thinking of ringing Dr. Meadows up again when she and Mr. Tonks came out and went along the passage. I stayed in my room.”

“You did not try to speak to Miss Phillipa?”

“We spoke through the wall. She asked me not to ring Dr. Meadows, but to stay in my room. In a little while, perhaps it was as much as twenty minutes—I really don’t know—I heard him come back and go downstairs. I again spoke to Phillipa. She implored me not to do anything and said that she herself would speak to Dr. Meadows in the morning. So I waited a little longer and then went to bed.”

“And to sleep?”

“My God, no!”

“Did you hear the wireless again?”

“Yes. At least I heard static.”

“Are you an expert on wireless?”

“No. I know the ordinary things. Nothing much.”

“How did you come to take this job, Mr. Hislop?”

“I answered an advertisement.”

“You are sure you don’t remember any particular mannerism of Mr. Tonks’s in connection with the radio?”

“No.”

“Will you please ask Mrs. Tonks if she will be kind enough to speak to me for a moment?”

“Certainly,” said Hislop, and went away.

Septimus’s wife came in looking like death. Alleyn got her to sit down and asked her about her movements on the preceding evening. She said she was feeling unwell and dined in her room. She went to bed immediately afterwards. She heard Septimus yelling at Phillipa and went to Phillipa’s room. Septimus accused Mr. Hislop and her daughter of “terrible things.” She got as far as this and then broke down quietly. Alleyn was very gentle with her. After a little while he learned that Septimus had gone to her room with her and had continued to speak of “terrible things.”

“What sort of things?” asked Alleyn.

“He was not responsible,” said Isabel. “He did not know what he was saying. I think he had been drinking.”

She thought he had remained with her for perhaps a quarter of an hour. Possibly longer. He left her abruptly and she heard him go along the passage, past Phillipa’s door, and presumably downstairs. She had stayed awake for a long time. The wireless could not be heard from her room. Alleyn showed her the curtain knobs, but she seemed quite unable to take in their significance. He let her go, summoned Fox, and went over the whole case.

“What’s your idea on the show?” he asked when he had finished.

“Well, sir,” said Fox, in his stolid way, “on the face of it the young gentlemen have got alibis. We’ll have to check them up, of course, and I don’t see we can go much further until we have done so.”

“For the moment,” said Alleyn, “let us suppose Masters Guy and Arthur to be safely established behind cast-iron alibis. What then?”

“Then we’ve got the young lady, the old lady, the secretary, and the servants.”

“Let us parade them. But first let us go over the wireless game. You’ll have to watch me here. I gather that the only way in which the radio could be fixed to give Mr. Tonks his quietus is like this: Control knobs removed. Holes bored in front panel with fine drill. Metal knobs substituted and packed with blotting paper to insulate them from metal shafts and make them stay put. Heavier flex from adapter to radiator cut and the ends of the wires pushed through the drilled holes to make contact with the new knobs. Thus we have a positive and negative pole. Mr. Tonks bridges the gap, gets a mighty wallop as the current passes through him to the earth. The switchboard fuse is blown almost immediately. All this is rigged by murderer while Sep was upstairs bullying wife and daughter. Sep revisited study some time after ten-twenty. Whole thing was made ready between ten, when Arthur went out, and the time Sep returned—say, about ten-forty-five. The murderer reappeared, connected radiator with flex, removed wires, changed back knobs, and left the thing tuned in. Now I take it that the burst of static described by Phillipa and Hislop would be caused by the short-circuit that killed our Septimus?”

“That’s right.”

“It also affected all the heaters in the house. Vide Miss Tonks’s radiator.”

“Yes. He put all that right again. It would be a simple enough matter for anyone who knew how. He’d just have to fix the fuse on the main switchboard. How long do you say it would take to—what’s the horrible word?—to recondition the whole show?”

“M’m,” said Fox deeply. “At a guess, sir, fifteen minutes. He’d have to be nippy.”

“Yes,” agreed Alleyn. “He or she.”

“I don’t see a female making a success of it,” grunted Fox. “Look here, Chief, you know what I’m thinking. Why did Mr. Hislop lie about deceased’s habit of licking his thumbs? You say Hislop told you he remembered nothing and Chase says he overheard him saying the trick nearly drove him dippy.”

“Exactly,” said Alleyn. He was silent for so long that Fox felt moved to utter a discreet cough.

“Eh?” said Alleyn. “Yes, Fox, yes. It’ll have to be done.” He consulted the telephone directory and dialed a number.

“May I speak to Dr. Meadows? Oh, it’s you, is it? Do you remember Mr. Hislop telling you that Septimus Tonks’s trick of wetting his fingers nearly drove Hislop demented. Are you there? You don’t? Sure? All right. All right. Hislop rang you up at ten-twenty, you said? And you telephoned him? At eleven. Sure of the times? I see. I’d be glad if you’d come round. Can you? Well, do if you can.”