Three flights down I heard footsteps behind me in the almost pitch dark of the stairwell. As I scampered blindly down I wondered if I could take him; but then I wasn’t armed and he was. What was more, he was a professional. I tripped and fell, scrambling up again even as I hit the landing, reaching out for the banister and wrenching myself down another flight, ignoring the pain in my elbows and forearms, with which I had broken my fall. At the top of the last flight I saw a light underneath a door and jumped. It was further than I thought but I landed well, on all fours. I hit the bar on the door and crashed out into the alley.

There were several cars, all of them parked in a neat row, but it wasn’t difficult to spot Red Dieter’s grey Bugatti Royale. I unlocked the door and opened the glove-box. Inside there were several small paper twists of white powder and a big revolver with a long barrel, the sort that puts a window in an eight-centimetre-thick mahogany door. I didn’t have time to check whether it was loaded, but I didn’t think that Red was the sort who kept a gun because he liked playing Cowboys and Indians.