"Well, don't worry. I haven't heard one of them ever hint it. I tell you they are off on different tacks. I'd be breaking confidence if I said more than that. And now, if you don't mind, Felix, I'll be off. It was a devilish late night last night and you look as if you wanted sleep too. Take a couple of aspirins and a peg and leave off worrying. Good night."

"Good night, Nigel. We've never known each other particularly well, but I hope we may from now on. I'm rather grateful to you."

"Bosh. Good night."

It was half-past ten when Nigel got back to Chester Terrace, and he was, he discovered, dead tired. He had, however, a story to write for to-morrow, and he didn't want to leave it till the morning.

Very wearily he sat down to his typewriter and ran in a sheet of paper. He thought for a moment and then began to tap at the keys:

"THE UNICORN MURDER.

"Fresh Developments

Saint Libel Case Recalled."

As he worked his thoughts kept turning to Alleyn. The inspector ought to know about Felix. At last he reached out his hand and took up the telephone. Surely by this time Alleyn would be home. He dialled the number of his flat, rested his head on his hand and waited.

CHAPTER FIFTEEN

Achilles' Heel

AFTER NIGEL and Inspector Fox had gone out of the room, and the door was shut, Inspector Alleyn stood very still and listened to their footsteps dying away down the passage. He heard Fox speak to the constable at the entrance door, and a little later their voices floated up from the footpath beneath.

If an onlooker had been there, he might perhaps have supposed Alleyn's thoughts were unpleasant ones. The inspector had the type of face that is sometimes described as "winged." The corners of his mouth made two deep depressions such as a painter will render with a crisp upward stroke of the brush. His nostrils, too, slanted up, and so did the outside corners of his very dark eyebrows. It was an attractive and fastidious face and, when nobody watched him, a very expressive one. At the moment it suggested extreme distaste. One might have guessed that he had just done something that was repugnant to him, or that he was about to undertake a task which displeased him.