"Follow that automobile which is just starting and don't lose sight of it!"
Wulf turned inquiringly:
"It's the Marquis de Sérac."
"Why, is he the man we are after?" Then turning again to the chauffeur:
"Have you plenty of gasoline?"
"Enough to run a hundred miles, Monsieur."
The chase began at the Boulevard de Courcelles, continued through the Place de l'Etoile and the Avenue de la Grande Armée. The two taxis, of the same horsepower, kept an equal pace, but the Marquis de Sérac's chauffeur seemed the smarter man. At any rate, he was the more daring. He dodged in and out of the traffic and began to gain on his pursuers.
"He's taking us to the Bois," growled Juve, as they made a turn to the left after passing the fortifications, before the Barrière de Neuilly. The pace increased in the back streets and then, suddenly, the taxi of the Marquis de Sérac disappeared!
It had turned sharply down a narrow street.