"Quite so. I can always do anything on principle, and I've yet to meet the job that I'm unwilling to tackle!"

He glanced sideways at me. I didn't like the look he gave me. There was too much of appraisement in it, something that was alien to the nature of the man, a sort of cold, calculating shrewdness that made me wonder again if I had not been mistaken in my estimate of him and the extent of his good-nature.

"If you keep on admiring me instead of looking where you're going," I hinted, "you'll end up in a funeral. That motor-bus isn't the sort of thing I'd care to hit."

He twisted the wheel over a fraction and edged out beyond the motor-bus before he replied. "Life is full of thrills," he remarked when at last we reached the comparative security of open space. There was a challenge in his voice that I thought it well to ignore.

"It is," I agreed. "Too much so."

For all the lightness of his speech and the careless ease with which he took unnecessary and avoidable risks I had a feeling that there was deep design under everything he did. Though I couldn't have proved it if I'd been asked, I felt sure that he was trying my nerve. After all there's no better test of that than the crowded traffic of a big city. I've met men who'd cheerfully face a crowd of howling cannibals and yet would develop a very bad case of jumps if asked to cross a street roaring and humming with traffic. Yes, clearly he was testing me.

With a jerk that nearly shot me out of my seat the car pulled up. I stared about me. We had stopped outside a substantial red-tiled house, built in the bungalow fashion. There was a well-kept lawn in front of it, with here and there a trim flower-bed to relieve the monotony of the expanse of grass.

"This is the place," Bryce said. "Just slip down and open that gate, will you?"

He gesticulated towards a six-foot gate at the side of the house. From my position in the car I could see that it opened on a path that ran round the side of the building and almost certainly led to the garage. Accordingly I slipped out on the road, walked up to the gate and found that, by standing on tip-toe, I could just reach the catch at the top. I swung it back, pushed with my weight against the erection and the gate came open.

As I turned to come back to the car I caught sight of a man standing on the opposite corner. He was engaged in lighting a cigarette in the cup of his hands. He seemed to be taking an undue time over it, and that and something that I could not put a name to in his attitude convinced me that he was watching us. His hands were so cupped that they hid his face, but I received an impression, that was almost a certainty, that he was watching Bryce and myself through his fingers. Perhaps my prolonged stare convinced him that I was fully aware of his presence and its meaning. At any rate he twisted on his heel so that his back was turned to us, dropped the match he had been playing with and ostentatiously struck another.