It's neat."

"You don't sound very enthusiastic about it."

"It's the coat. If you were going to drown a woman in the sea, would you wear an overcoat to do it?"

"I don't know. 'Pends how I meant to drown her."

"How would you drown her?"

"Go swimming with her and keep her head under."

"You'd have scratches that way, ten to one. Evidence."

"Not me. I'd catch her by the heels in shallow water and upend her. Just stand there and hold her till she drowned."

"Williams! What resource. And what ferocity."

"Well, how would you do it, sir?"

"I hadn't thought of aquatic methods. I mightn't be able to swim, or I mightn't like early-morning dips, or I might want to make a quick getaway from a stretch of water containing a body. No, I think I'd stand on a rock in deep water, wait till she came to talk to me, grip her head and keep it under. The only part of me that she could scratch that way would be my hands. And I'd wear leather gloves. It takes only a few seconds before she is unconscious."

"Very nice, sir. But you couldn't use that method anywhere within miles of the Gap."

"Why not?"

"There aren't any rocks."

"No. Good man. But there are the equivalent. There are stone groins."

"Yes. Yes, so there are! Think that was how it was done, sir?"

"Who knows? It's a theory. But the coat still worries me."

"I don't see why it need, sir. It was a misty morning, a bit chilly at six. Anyone might have worn a coat."

"Y-es," Grant said doubtfully, and let the matter drop, this being one of those unreasonable things which occasionally worried his otherwise logical mind (and had more than once been the means of bringing success to his efforts when his logic failed).

He gave Williams instructions for his further inquiries, when he himself should be in town. "I've just had another few minutes with Tisdall," he finished. "He has got himself a waiter's job at the Marine. I don't think he'll bolt, but you'd better plant a man. Sanger will do. That's Tisdall's car route on Thursday morning, according to himself." He handed a paper to the sergeant. "Check up on it. It was very early but someone may remember him. Did he wear a coat or not? That's the main thing. I think, myself, there's no doubt of his taking the car as he said. Though not for the reason he gave."

"I thought it a silly reason myself, when I read that statement.