“Rex very unsettled since return from Europe last summer — went lone hunting expedition in Rockies August September — went South America October — stayed West Indies on return trip — went Russia late November against my wish ostensibly investigate commercial conditions properly accredited by me — letter received dated December fourth stating safe arrival no news since — became worried end December put inquiry through Embassy — Rex left Moscow December eleventh destination unknown — all efforts to trace movements so far unavailing — spare no expense cable any news immediately now very anxious Channock Van Ryn.”

Simon nodded. “Expensive cable that!”

The Duke crossed his slender legs, as he settled himself comfortably in an arm-chair. “That I think would hardly matter to Channock Van Ryn, and Rex, you will remember, is his only son. I am not surprised that he is anxious, but if there was ever any doubt about the message having come from our young friend, I think this cable places the matter beyond dispute.”

“Umm,” Simon nodded. “Now let’s see — today’s the 24th of January, isn’t it? At any rate, it’s nearly seven weeks since he disappeared from Moscow.”

“Exactly, but there is one comfort: we know at least that he has not been knocked on the head in some low quarter of the town and his body flung into the river — or pushed under the ice, rather — for, of course, the Moskawa River will be frozen over now. He must have fallen foul of the secret police in some way — our young friend is nothing if not inquisitive — and I believe there are very definite restrictions as to what visitors to the Soviet may, or may not, see during their stay.”

“Wait a moment!” Simon slowly revolved his brandy-glass, holding it in the palm of his hand to warm the spirit through the thin transparent glass — “Wait a minute,” he repeated, “that cable said ‘left Moscow for an unknown destination’!”

“Yes,” agreed the Duke, “and during the last few days I have been gathering information regarding other places to which he may have gone. I think you would be surprised at the knowledge which I now possess of the towns and railways of the Soviet Republic.”

“How — er — did you set about it?” Simon asked curiously.

“The obvious way, my friend.” De Richleau’s clever face broke into a sudden smile. “I paid a visit to the London office of the ‘Intourist’, which as you may know, is the official travel bureau of the Soviet. For some time now, Stalin and the present group of Kommissars have thought it desirable that people of the anti-Bolshevik states should be encouraged to visit Russia. For one thing they spend money which the Soviet badly needs — for another, they are shown certain aspects of the Bolshevik State, such as the great Metalurgical works, and scientifically run agricultural centres, of which the Kommissars are justly proud. It is hoped that they will return to their own countries with a glowing picture of the benefits of Communism for the masses.”

“But you can’t just take a ticket and go to Russia, can you?” Simon spoke doubtfully.