The butler had explained that the dinner-hour was seven thirty; that, not five minutes before, he had seen his master come down-stairs and enter the library, where, at seven fifty-five, on going to ask if he had heard the gong, he had obtained no answer but found the door locked on the inside; that he had then hastened round by the garden, and in through the French window, to discover the deceased gentleman lying in his blood.

The head gardener, who lived in the lodge, had sworn to having seen a bareheaded man rush past his windows and out of the gates about the same hour, as he knew by the sounding of the gong up at the house; they often heard it at the lodge, in warm weather when the windows were open, and the gardener swore that he himself had heard it on this occasion.

The footman appeared to have been less positive as to the time of the telephone call, thought it was between four and five, but remembered the conversation very well. The gentleman had asked whether Mr. Craven was at home, had been told that he was out motoring, asked when he would be back, told he couldn't say, but before dinner some time, and what name should he give, whereupon the gentleman had rung off without answering. The footman thought he was a gentleman, from the way he spoke. But apparently the police had not yet succeeded in tracing the call.

"Is it a difficult thing to do?" asked Cazalet, touching on this last point early in the discussion, which even he showed no wish to avoid this morning. He had dropped his paper, to find that Toye had already dropped his, and was gazing at the flying English fields with thoughtful puckers about his somber eyes.

"If you ask me," he replied, "I should like to know what wasn't difficult connected with the telephone system in this country! Why, you don't have a system, and that's all there is to it. But it's not at that end they'll put the salt on their man."

"Which end will it be, then?"

"The river end. That hat, or cap. Do you see what the gardener says about the man who ran out bareheaded? That gardener deserves to be cashiered for not getting a move on him in time to catch that man, even if he did think he'd only been swiping flowers. But if he went and left his hat or his cap behind him, that should be good enough in the long run. It's the very worst thing you can leave. Ever hear of Franz Müller?"

Cazalet had not heard of that immortal notoriety, nor did his ignorance appear to trouble him at all, but it was becoming more and more clear that Hilton Toye took an almost unhealthy interest in the theory and practise of violent crime.

"Franz Müller," he continued, "left his hat behind him, only that and nothing more, but it brought him to the gallows even though he got over to the other side first. He made the mistake of taking a slow steamer, and that's just about the one mistake they never did make at Scotland Yard. Give them a nice, long, plain-sailing stern-chase and they get there by bedtime—wireless or no wireless!"