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       Scotland Yard

      It was on Monday morning, the 7th of October, that Inspector French first heard the name of Sir John Magill. A commonplace name enough, certainly a name bearing no suggestion of exasperating mystery, still less of grim and hideous tragedy. All the same there came a time when French might well have said of it, as Queen Mary is supposed to have said of that of Calais, that when he died it would be found graven on his heart.

      For the Sir John Magill Case proved perhaps the most terribly baffling of all the baffling cases French had tackled. Never had truth seemed so elusive, nor had he been put to such shifts to capture it, as during that long-drawn-out inquiry. Never had his conviction been stronger that crime, ugly and sinister, lurked behind the activities he was investigating, yet seldom had the proof that all was well seemed more convincing. In short, many times before the case dragged on to its inevitable and dramatic close French found himself wishing nothing so much as that he had never heard of the unfortunate man who gave it its name.

      French had had a busy year. Since the night, now thirteen months past, when he and Sergeant Carter had fought for their lives and the life of Molly Moran on the deck of that spectral launch in Southampton Water, he had handled no less than five major cases. Moreover, four months of the time had been spent with a score of associates in trying to trace the author of one of those terrible series of sex murders which every now and then recall the shuddering days of Jack the Ripper. By the time this unhappy madman had been laid by the heels, September was well advanced, and then had come the blissful break of French’s annual holidays.

      He had spent it among the old world towns and rocky hills of Provence. When he was tracing the movements of the Pykes in the Burry Port-Dartmoor tragedy he had worked along the French Riviera and up through the Rhône Valley to Lyons and Paris. He remembered that Jefferson Pyke had recommended a stay at Avignon, and the night he had spent there on that investigation had convinced him of the excellence of the advice. Accordingly this autumn he had made the old city of the popes his headquarters. From there he and Mrs French had explored the country by automobile excursion, had marvelled at the arenas of Arles and Nîmes, with bated breath had crossed the Pont du Gard, had seen mediævalism in the walls and towers of Aigues Mortes, had climbed through the sinister ruins of Les Baux; in short, as far as fourteen brief days would allow, had steeped themselves in the enthralling atmosphere of Roman France. And now he had scarcely settled down to a winter’s work when the name of Sir John Magill had flashed into his firmament as a portent of menace and evil.

      It was then on Monday, the 7th of October, shortly after French had reached the Yard, that a telephone call summoned him to the room of his immediate superior, Chief-Inspector Mitchell.