it snapped into focus his equilibrium came back and he was secure again. He raised his eyes, ready to work his way down the wall, and then he saw it - a thin line of lesser darkness in the dark where the laths ran.
‘There.’
‘There what?’
He slowly lowered himself and put one foot on the floor. From that level, the line of faint light was invisible. He worked his way up again, put his face against the clumps of plaster and the rough wood of the lath and looked down and so could see it. He put his hand on it, first hiding the light, then working the hand down until the light showed, then finding the exact lath and pushing on it and watching the light all but disappear.
He got down again, keeping his fingers on the lath. He tried pulling on it, catching it at top and bottom with his fingernails, and then he could see a little, dim line as the lath pulled away a fraction of an inch but wouldn’t come free. He tried it several ways, and it was only when he pushed from the bottom that the lath moved upwards and could then be worked up over the roughness above it until it stopped, caught on something above. He felt the movable piece with his fingers in the dark and found that a piece of lath about two inches long had been scarfed on both ends so that they fitted under matching scarves on the strip in the wall - that, in fact, somebody rather skilled had cut the lath twice at an angle. Probing with a finger below this cut-out section, he found a hole.
He leaned forward. His hat brim hit the wall first; he removed the hat and put it behind him on the chair, leaned forward again, felt the tickle of a horsehair. He put his eye to the dim light and found himself looking, as he expected, into the back of Balmoral Castle and, beyond it, Stella Minter’s room.
The hole in the reverse painting was big enough that he could see all of the far wall and the oval window in it, through which the light from the outside gas lamp was shining. He could barely make out the shape of the bed, which was below him and close to the wall through which he was looking, most of it invisible because of the dark bloodstains. Yet, he thought, with the gas light on above the bed - now to his left and higher - especially with its silver reflector, somebody standing here could have seen a good deal. Everything that went on in the bed, certainly. He thought of the reflector on the gas lamp: that might have been the work of the person who had cut the lath, too.
‘Have a look.’ He pulled Munro into the place where he had been standing and put Munro’s hand on the rough lath and plaster and led it to the hole.
‘Voyeur,’ Munro said after perhaps twenty seconds.
Odd, then, that the closet door was unlocked.
Munro pushed back, and Denton heard the door latch. ‘This changes the price of fish,’ Munro said. ‘Willey will have to be told.’
Denton worked the cut piece of lath back into its niche and took up his hat and stepped out into the corridor.
The house was making sounds, as a house with a dozen or so people in it must. A medley of cooking smells reached him, too, not a bad odour at all, a blend like meat-and-vegetable stew, balm after the closet. Munro was straightening his hat, looking solemn; when the hat was right, he headed down the corridor towards the back of the house. Denton put his own hat on and walked behind him, passing doors on both sides, coming at the end to a kitchen on his left, the door open, and a water closet on his right, the door also open. The water closet was filthy, the kitchen fairly clean; both, he supposed, communal. Three people were eating at a table in the kitchen; two men, one of them the man who had opened the front door for them, were standing by a big coal range, staring into pots. When Munro stepped into the doorway, everybody looked at him and everything stopped. No need to say he was a policeman; the man in the collarless shirt had no doubt already told them what had happened at the front door.
‘What’s the name of the landlord?’ Munro