The vivid memory of our recent, nerve-fraying night-time flight over the Himalayan foothills winced across his face, but Holmes' upper lip was nothing if not stiff. “Up to you,” he replied mildly, and returned to pouring the tea. I addressed myself to the telephone.

“Perhaps you could get the details of both, and we could decide which fits better with our plans. Thank you.”

Holmes brought me a cup of tea and a selection of sandwiches, settling down at the window with his own refreshment. He ate two sandwiches in rapid succession, then sat back with his cup. “Have you a schedule for the morrow?” he asked.

“Norbert's arranged various appointments in the morning, but I have the rest of the day free. Would you like to see something of the city? We could go out to the ocean and sun-bathe, if the sun comes out. And there's a famous salt-water baths out there as well, if you'd like those.”

He fixed me with a disbelieving gaze. “You wish to play the tourist?”

I kept the innocent expression on my face for as long as I could, but a slight movement of my mouth gave me away, and the answering relief on his face released the laughter. “Holmes, I wouldn't think of getting in the way of your glass plates.”

He shook his head with disapproval, but said only, “You shall ask Mr Norbert about the keys?”

“Certainly, and if he knows where I can find Mah and Micah.”

“You might also enquire if his watch-dogs saw anything out of the ordinary before the twentieth of March.”

“I shall.”

In the end, we did play the part of tourists, for that evening at least. We took a motorcar out to where San Francisco ended, and ate dinner at the Cliff House restaurant with the Pacific Ocean pounding at our feet, watching the sun go down. Wine again proved to be available, albeit decanted into an anonymous pitcher, and if the cooking was not as exceptional as the view out of the windows, the food was palatable. When we had finished our coffee, we walked down the steep hill and onto the sand, strolling along the beach. The wind had died down and the fog was lying well off-shore; it was quite pleasant.

At the far end, with the western sky darkening towards deepest indigo, Holmes settled onto a section of the sea wall that kept the sand at bay and took out his tobacco.

“Is this beach familiar to you?” he asked.