Quarter of a mile further along, Wolf found a spot to hide the car and cut back on foot through the darkness, taking with him the things he needed. Karswell Hall was encircled by a high stone wall that he scaled with ease, and he dropped down inside the wooded grounds and made his cautious way towards the house. From a vantage point among the trees he was able to observe as more cars arrived, one every couple of minutes, and paused at a checkpoint on the private road where security guards checked papers before waving the visitors on through towards the stately home. It looked like some kind of late-evening event or gathering was underway.

It was 11.22 p.m. and he should have reported to base hours ago. Wolf was all too aware that his employers back in London would be wondering what the hell was happening. He faced the choice of whether to abort his mission and admit failure, or stay on his target until a suitable opportunity arose to eliminate him and make it look like an accident.

Wolf had never admitted failure in his life. He was still figuring out his best move when a black Mercedes limousine purred up to the checkpoint and was halted by the security men. The chauffeur rolled down his window and showed them an admission pass. While they examined it, the driver stepped out of the car for a moment to check a front tyre, and the cabin of the limo was momentarily illuminated by the interior light.

That was when Wolf realised, with a shock, that he knew both of the backseat passengers.

Wolf had personally met very, very few members of the secretive agency he worked for. But he instantly recognised these two men as his superiors. One was a much older man, easily eighty-five, wizened and gaunt, wearing a black suit and sitting in the back of the car clutching a cane between his knees. A very distinctive cane, topped with a silver bird’s head with a long beak and ruby eyes. Wolf remembered it, though he’d only seen the old man once before. The other backseat occupant, twenty years younger than his travelling companion, was someone Wolf had had occasional contact with over the years.

The car moved on through the checkpoint, but the image of the two men remained burned on Wolf’s retinas. What was going on here? Why were his agency chiefs apparently attending the same mysterious gathering as the very target they had directed him to eliminate earlier that day? Wolf generally never questioned the reasoning behind his directives, but this was weird. It seemed to suggest that they were all somehow involved together – though in what, Wolf had no idea. And if that was right, then it meant that Wolf had unwittingly become involved in some kind of plot to eliminate one of their own. But one of their own what?