Well, thought Rebus, I bet he didn’t go to any more hops. Then he winced, trying to forgive himself for thinking such a thing. His guide saw the wince and laid the hand back on his arm.

‘All right, son, all right.’ And they were all looking at him again, perhaps expecting tears. Rebus was growing red in the face.

‘I’ll just…’ he said, motioning towards the ceiling with his head.

‘You know where it is?’

Rebus nodded. He’d seen all there was to see downstairs, and so knew the bathroom must lie upstairs, and upstairs was where he was heading. He closed the kitchen door behind him and breathed deeply. There was sweat beneath his shirt, and the headache was reasserting itself. That’ll teach you, Rebus, it was saying. That’ll teach you for taking a sip of whisky. That’ll teach you for making cheap jokes to yourself. Take all the aspirin you like. They’ll dissolve your stomach lining before they dissolve me.

Rebus called his headache two seven-letter words before beginning to climb the stairs.

He gave careful scrutiny to each stair as he climbed, and to the walls either side of each stair. The carpet itself was fairly new, with a thickish pile. The wallpaper was old, and showed a hunting scene, horse-riders and dogs with a fox panting and worried in the distance. As Patience Aitken had said, there were no scrapes or claw-marks on the paper itself. What’s more, there were no loose edges of carpet. The whole thing had been tacked down with a professional’s skill. Nothing for George Gallagher to trip over, no threads or untacked sections; and no smooth threadbare patches for him to slip on.

He gave special attention to where the upstairs landing met the stairs. George Gallagher probably fell from here, from this height. Further down the stairs, his chances of survival would have been much greater. Yes, it was a steep and narrow staircase all right. A trip and a tumble would certainly have caused bruising. Immediate death at the foot of the stairs would doubtless have arrested much of the bruising, the blood stilling in the veins and arteries, but bruising there would have been. The post-mortem would be specific; so far Rebus was trading on speculation, and well he knew it.