He was also fortunate in the fact that his soldier chauffeur, when given the choice, decided to wait and drive him to the Rue Henri. The man was candid as to his own plans for the evening.

“When I put the car up I’ll have a hot bath and go to bed, sir,” he said. “I’ve not had five hours’ sleep straight on end during the past three weeks, an’ I know wot’ll happen if I start hittin’ it up around these bullyvards. Me for the feathers at nine o’clock! So, if you don’t mind, sir——”

Martin knew what the man meant. He wanted to be kept busy. One hour of enforced liberty implied the risk of meeting some hilarious comrades. Even in Paris, strict as the police regulations may be, Britons from the front are able to sit up late, and the parties are seldom “dry.”

So officer and man removed some of the marks of a long journey, ate a good meal, and about eight o’clock arrived at Mrs. Saumarez’s house. Life might be convivial enough inside, but the place looked deserted, almost forbidding, externally.

Indeed, Martin hesitated before pressing an electric bell and consulted a notebook to verify the street and number given him by the subaltern on the night von Struben was captured. But he had not erred. His memory never failed. There could be no doubt but that his special gift in this direction had been responsible for a rapid promotion, since military training, on the mental side, depends largely on a letter-perfect accuracy of recollection.

When he rang, however, the door opened at once. A bareheaded man in civilian attire, but looking most unlike a domestic, held aside a pair of heavy curtains which shut out the least ray of light from the hall.

Entrez, monsieur,” he said in reply to Martin, after a sharp glance at the car and its driver.

Martin heard a latch click behind him. He passed on, to find himself before a sergeant of police seated at a table. Three policemen stood near.

“Your name and rank, monsieur?” said this official.