“Not because she murdered Master,” grunted Alleyn. “It’s a right-handed job if ever there was one.”

“She may be ambidextrous.”

“I don’t think so. She opened and closed the door, marked the plan, and took out her handkerchief with the left hand. She used the left hand every time she ministered to Lady Wutherwood. She’s not our pigeon, unless she’s an accessory to the blasted fact. What do you think, Fox?”

“I should say she’s got a snug job with her ladyship,” said Fox, glancing up from his notes and over the top of his glasses.

“Well, I must be off,” said Curtis. “See about this P.M. Fox rang up the coroner. I’ll start first thing in the morning. Cairnstock has an operation to-morrow and said he’d come and have a look later on. Don’t expect we’ll find anything of interest to you. I’ll ring you up about mid-day. Good night.”

He went out. Fox closed his note-book and removed his spectacles. Somewhere in the flat a clock struck eleven.

“Well, Br’er Fox,” said Alleyn. “So it goes on. We’d better see another Lamprey. What’s your fancy? Suppose we follow Master Henry’s suggestion and talk to his mother.”

“Very good,” said Fox.

“We’d better let Lady Katherine go home. We can’t keep them all boxed up in here indefinitely, I suppose.” He looked at the constable. “My compliments to Lady Charles Lamprey, Gibson, and I’d be grateful if she could spare me a few minutes. And say that we shall not trouble Lady Katherine Lobe any further tonight. You won’t call them Lady Lamprey and Lady Lobe, will you? And warn the man on duty in the entrance that Lady Katherine is to be allowed out. She lives at Hammersmith, Fox. We’ll have to keep an eye on her, I suppose.”

“She’s not exactly the cut of a murderess, is she?” Fox remarked.