Since London Underground had only just got back to normal service after the snow, there was no way they were going to shut down the Circle Line while we explored. So we were going to wait until the official shut-down at one in the morning. Kumar suggested that I get some rest and reconvene later to get tooled up.

So, leaving Lesley to keep an eye on the house that wasn’t there, I went home to the Folly for a meal and a sleep. I got up at eight, had a hot bath and took Toby for a walk in Russell Square. It was cold and crisp and the sky was so clear that if it hadn’t been for London’s chronic light pollution I’m sure I would have seen stars. I’d agreed to meet Kumar back in Bayswater around ten, so as soon Toby had finished marking his territory I headed back in to get my gear. As I crossed the atrium Molly emerged suddenly from the shadows. I jumped. I always jump, and that seems to give Molly endless amusement.

‘Will you stop doing that?’ I said.

Molly gave me a bland look and held out a holdall bag. I recognised it as Lesley’s. I took it and promised faithfully to make sure she got it. I managed to resist the urge to go rummaging around inside it, my willpower being bolstered by the fact that you never knew when Molly might be watching you from the shadows.

To my surprise, Nightingale was waiting in the garage by the Jag.

‘I’ll drive you over,’ he said. He was in his heavy dark blue suit with a matching Aran jumper and his serious plain brown lace-ups. His Crombie greatcoat was hung up in the back of the car.

‘Are you supervising tonight?’ I asked once we were seated.

Nightingale started the Jag and let the engine warm for a bit. ‘I thought I’d spell Lesley,’ he said. ‘Dr Walid doesn’t want her getting overtired.’

I often forget how good a driver Nightingale is, especially in the Jag. He insinuates himself through the traffic like a tiger padding through a jungle, or at least how I imagine a tiger pads through a jungle. For all I know the damn things swagger through the forest like Rottweilers at a poodle show.

While he drove I filled him in on the complex details of tonight’s operation.

‘Me and Kumar are going to drop down through the hatch, meet up with his patrolman and see if we can track where the veggies went,’ I said.

‘Kumar and I,’ said Nightingale. ‘Not “me and Kumar”.’ Nightingale periodically attempted to improve my grammar and was curiously deaf to what I consider a pretty convincing and sophisticated argument that the rules of English grammar are largely an artificial construct with little or no bearing on the language as it is spoke.