Levasseur under her nurse's uniform. She cast round her eyes as if to make sure that she was not being followed, and then took a cab and drove down the boulevard and the Rue de la Pépinière, to the Gare Saint-Lazare.
Don Luis saw her from a distance climbing the steps that run up from the Cour de Rome; and, on following her, caught sight of her again at the ticket office at the end of the waiting hall.
"Quick, Mazeroux!" he said. "Get out your detective card and ask the clerk what ticket she's taken. Run, before another passenger comes."
Mazeroux hurried and questioned the ticket clerk and returned:
"Second class for Rouen."
"Take one for yourself."
Mazeroux did so. They found that there was an express due to start in a minute. When they reached the platform Florence was stepping into a compartment in the middle of the train.
The engine whistled.
"Get in," said Don Luis, hiding himself as best he could. "Telegraph to me from Rouen; and I'll join you this evening. Above all, keep your eyes on her. Don't let her slip between your fingers. She's very clever, you know."
"But why don't you come yourself, Chief? It would be much better"
"Out of the question. The train doesn't stop before Rouen; and I couldn't be back till this evening. The meeting at the Prefect's is at five o'clock."
"And you insist on going?"
"More than ever. There, jump in!"
