When we arrived at Mycroft’s door, however, I had to admit that his self-prescribed fitness régime did not seem to be doing him any harm. He was up and around, and if he opened the door in his slippers and dressing-gown, he moved without hesitation and had colour in his face. There was also nearly a stone less of him than there had been on Christmas Day, which made his jowls flaccid and his eyes more hooded than usual.

“Many happy returns of the day, Mary,” he said, and to Holmes, “I believe you’ll find a corkscrew on the tray, if you’d be so kind.” After toasts came the inevitable discussion of the impending disaster that the new Labour government was certain to bring in. Predictions were rife that the institution of marriage was sure to be done away with, that rubles would replace the pound sterling, the Boy Scouts and the monarchy would be abolished, the House of Lords sold for housing flats—everything short of plagues and rains of frogs. There were strong rumours that the Prime Minister would refuse to step down to Labour’s minority vote, thus igniting a constitutional crisis if not outright revolution; the newspapers that morning had mentioned the concern of America, politeness thinly concealing Washington’s growing alarm. When I said something of the sort, Mycroft nodded.

“Yes, the Americans are becoming increasingly nervous about the Reds. They seem to envision a Socialist state that stretches from London to Peking, and don’t know whether to be more worried about the Bolsheviks succeeding, or about the chaos that will follow if they fail.”

When we had exhausted the various topics, we sat down to a meal only marginally less sumptuous than one of Mycroft’s usual, accompanied by what passed for small talk and polite conversation in the Holmes household, in this case an interesting development in forensic science from America and a nice murder that was baffling the authorities. Dessert was a small decorated cake, which none of us ate.

The pouring of coffee, offer of brandy, and fingering of cigars indicated that the meal was finished, business could be resumed. The talk circled back through the Labour victory and the huge problems facing a minority government, before Mycroft took a last, ritual mouthful from his cup, put it onto the table, and asked, “Have you been following the news from Russia?”

My head snapped up as if he’d hauled back on my reins—which in a way, he had: I knew him far too well to think his question innocent. “No!” I said sharply, before things could edge one syllable further down that slippery slope. “I absolutely refuse to go to Moscow in January.”

He made a show of shifting feebly in his chair, letting out a quiet sigh of infirmity before he looked up. “I said nothing about Moscow.”

“Siberia, then. Some place either deadly or freezing, or both.”