They travelled by 'bus from Grays Inn Road as far as Oxford Circus, and walked along a number of quiet secluded streets—the backwaters of the West End—in order to reach Sherryman Street from the lower end, which, with a true sense of the fitness of things, was called Sherryman Street Approach. If the Approach had not been within a stone's throw of Sherryman Square it might have been called a slum. It had tenement houses with swarms of squalid children playing in the open doorways, its shops offered East End food—mussels and whelks, "two-eyed steaks," reeking fish-and-chips, and horsemeat for the cheap foreign element. There were several public-houses with groups of women outside drinking and gossiping, all wearing the black shawls which are as emblematic of the lower class London woman as a chasuble to a priest, or a blue tattooed upper lip to a high-caste Maori beauty. A costermonger hawked frozen rabbits from a donkey-cart, with a pallid woman following behind to drive away the mangy cats which quarrelled in the road for the oozing blood which dripped from the cart's tail. An Italian woman, swarthy, squat, and intolerably dirty, ground out the "Marseillaise" from a barrel-organ with a shivering monkey capering atop, waving a small Union Jack, and impatiently rattling a tin can for coppers.

To turn from this squalid quarter into Sherryman Street was to pass from the east to the west end of London at a step. It was as though an invisible line of demarcation had been drawn between the lower and upper portion of the street, and held inviolate by the residents of each portion. There were no public houses or fish-shops in Sherryman Street; no organ-grinders, costermongers, unclean children, or women in black shawls. It had quiet, seclusion, clean pavements, polished doorknockers, and white curtains at the windows of its well-kept houses, which grew in dignity to the semblance of town mansions at the Square end.

Number 10 showed a blank closed stone exterior to the passer-by, like an old grey secretive face. As they approached it Colwyn, with a slight movement of his head, drew his companion's attention to the upper windows which belonged to Nepcote's flat. The blinds were down.

"It looks as if Nepcote left last night," he said.

The sight of the drawn blinds, like yellow eyelids in the grey face, awakened some secret irritation in Caldew's breast, and with it the realization of his powers as an officer of Scotland Yard.

"I shall force a way in and see," he angrily declared.

"Better get a key from the housekeeper," suggested Colwyn. "The women who look after these bachelor flats always have duplicate keys. But the front door is ajar. Let us go upstairs first."

They ascended the stairs to the flat, and the first thing they noticed was a Yale key in the keyhole of the door.

"A sign of mental upset," commented Colwyn. "At such moments people forget the little things."

They opened the door and entered. The front room was much as Colwyn had seen it the previous night. The flowers drooped in their bowl; the chorus girls smirked in their silver settings; the framed racehorses and their stolid trainers looked woodenly down from the pink walls.