“They may be perfectly straightforward people,” Ruth said; “but where I was engaged in Red Cross work in America these two men—I am almost sure they are the same—worked under the names of Legrand and José, one supposedly a Frenchman and the other a Mexican. There was a fire and property was destroyed. Legrand and José were suspected in the matter, but I believe they got away without being arrested.”

“Mademoiselle, you put me under further obligations,” declared the police officer. “I shall make it my business to look up these two men—and their associates.”

“But, Monsieur, I may be wrong.”

“If it is proved that they are in disguise, that is sufficient. We are giving spies short shrift nowadays.”

His stern words rather troubled Ruth. Yet she believed she had done her duty in announcing her suspicions of the two men. Of Rose Mantel she said nothing. If the French prefect made a thorough investigation, as he should, he could not fail to discover the connection between the men and the chief of the Red Cross supply unit at the hospital.

Ruth’s arrangements were made in good season, and Clare and the other girls bade her a warm good-bye at the door of their pension. The ambulance that was going to Clair proved to be an American car of famous make with an ambulance body, and driven by a tall, thin youth who wore shell-bowed glasses. He was young and gawky and one could see hundreds of his like leaving the city high schools in America at half-past three o’clock, or pacing the walks about college campuses.

He looked just as much out of place in the strenuous occupation of ambulance driver as anyone could look. He seemingly was a “bookish” young man who would probably enjoy hunting a Greek verb to its lair. Tom Cameron would have called him “a plug”—a term meaning an over-faithful student.

Ruth climbed into the seat beside this driver. She then had no more than time to wave her hand to the girls before the ambulance shot away from the curb, turned a corner on two wheels, and, with the staccato blast of a horn that sounded bigger than the car itself, sent dogs and pedestrians flying for their lives.

“Goodness!” gasped Ruth when she caught her breath. Then she favored the bespectacled driver with a surprised stare. He looked straight ahead, and, as they reached the edge of the town, he put on still more speed, and the girl began to learn why people who can afford it buy automobiles that have good springs and shock absorbers.

“Do—do you have to drive this way?” she finally shrilled above the clatter of the car.