"The first thing being that the best murders oughtn't to look like murders," the criminologist agreed. "They ought to look like accidents, or suicides at the most. But it takes a Mostyn Scarth to cut as deep as that."

"Wot the 'ell mikes yer fink of 'im?" cried Croucher, in a fury at the very name.

"Well, among other things, the fact that he saw us off in the car just now. Do you mean to say you didn't see through the false beard of the gentleman who was picking up his umbrella as we turned into Wigmore Street?"

III

Never again did Alfred Croucher venture out alone, even as far as the pillar-box; not another letter had he to post, though he received one, wrapped round a stone, once when his window was open, and literally devoured every word. He did go out, but only with the crime doctor in his car, for an hour or two in the afternoon.

More than once they got out at Richmond Park, sent the car across to one of the other gates, and followed at a brisk walk, shoulder to shoulder, with Croucher often peeping over his, but Dollar never. The walk was sometimes broken for as long as it took Croucher to smoke a pipe in one or another of the beautiful wooded enclosures which are the inner glory of the most glorious of all public parks. There, under red canopies of dying leaves, their feet upon a russet carpet of the dead, the smoker would rest in a restless silence, because the one subject which had made him eloquent was now tabooed. Even in the Chamber of Peace there was no peace for Alfred Croucher, and but little sleep, although the doctor had walked him off his legs and would sit beside him till all hours. So the literary and conversational treatment had been altered once for all; and now the patient would hardly read or speak a word.

Late one night, in the second half of the month, the crime doctor, seated like a waxwork in a chair that never creaked, had just made sure that his man was asleep at last. He decided to steal out and write some letters, and take them to the post himself before locking up; and was getting by inches to his catlike feet, when some sense held him bent like a bow. It could hardly have been his hearing, in his own sound-proof sanctuary between double windows and triple doors. Yet suddenly he was all on edge, listening with nerves laid bare by forced vigils in that slumberous room, brown as an Arab in its weird lighting; the silver patch in his hair changed from a florin to a new penny, the whites of his eyes like broad gold rings; their one flaw augmented by an infinite fatigue, their one care the human wreckage on the bed—shattered utterly by him, to be by him built up afresh, but not in the midst of excursions and alarms. And here was the inmost door opening, so softly, so slowly, at deadliest dead of night!

It was a woman who entered like a ghost, and he knew her step, though he could not hear it even now. And though her cloak and head-dress were those of a trained nurse, he knew, rather than saw, that the wearer was Lady Vera Moyle.

"Hush!" she was the first to whisper, and very softly closed the last door, through which he would have hurried her out again. Already her soundless movements, her air of vast precaution, puzzled him even more than her presence or her dress; but he still had anxieties on this side of the door.

"Just asleep," he whispered, pointing to the bed. "Bad time I've given him, poor brute, but a better one coming, I do believe. Did you come to see how he was doing?" Even in the stained light she looked so beaming now, so frankly triumphant, he made sure that was it. "I'd have written, but thought you were away. Who let you in?"