No one did.

He opened the door and went down three flights of stairs, each flight divided with a half-landing. The stairs were of stone but covered now with druggeting of a dark purple colour. He ran down them, humming to himself, opened the street door and stepped out, blithely, and slammed the door behind him.

The girl was on the other side of the road.

Rollison showed no apparent interest in her, but turned right, towards other streets and, round the corner, a mews where he kept his car and Jolly’s. His was a two-year-old, grey-coloured Bristol, a hand-manufactured car which gave him much sensuous pleasure. He noticed an open M.G. sports car close to the entrance of the mews before unlocking his garage.

The M.G. was not empty when he drove out; the brown-haired girl was at the wheel and vibration of the exhaust pipe with its stainless steel fan-tail told him the engine was turning. He drove along Gresham Terrace, a street of tall, three-storey houses, some drab, some newly painted, and the girl followed. He crossed a stream of traffic in Piccadily, to turn right; and so did she. He took the underpass at Hyde Park corner but she did not; yet in Knightsbridge, opposite Harrods, she was close behind.

Occasionally, she appeared to lose him but as he drove on to the short section of the M4 Motorway, there she was; and when he went down to the cavern-like turn on to the Great West Road, she was on his heels. Until then he had simply allowed her to follow, but suddenly he put on speed, turned left at the first traffic lights into a road with houses on one side and the playing fields of ‘what seemed a private school on the other. He took the first turn right along here, and swung behind some trees; this was a place where he had caught followers before.

She passed the end of the street he was in, turning her head to try to see the Bristol. He was close enough to see the distress on her face; a kind of fear. There were no turnings off the street she was driving down and some distance along it was a level crossing; she might go on, hoping to catch up. Or she might turn back, thinking he had turned into the driveway of a house. He pulled out as soon as she had disappeared, and followed her — put on a burst of speed and suddenly brought the Bristol alongside the M.G.