Alas, Lupin well knew that this was a thing impossible to prove and that he must concentrate his efforts upon another point. But upon which? Was he to abandon the trail of the crystal stopper?
He could not make up his mind to that. His one and only diversion from the search was to go to Enghien, where the Growler and the Masher lived, and make sure that nothing had been seen of them since the murder at the Villa Marie-Thérèse. Apart from this, he applied himself to the question of Daubrecq and nothing else.
He refused even to trouble his head about the problems set before him: the treachery of the Growler and the Masher; their connection with the gray-haired lady; the spying of which he himself was the object.
“Steady, Lupin,” he said. “One only argues falsely in a fever. So hold your tongue. No inferences, above all things! Nothing is more foolish than to infer one fact from another before finding a certain starting-point. That’s where you get up a tree. Listen to your instinct. Act according to your instinct. And as you are persuaded, outside all argument, outside all logic, one might say, that this business turns upon that confounded stopper, go for it boldly. Have at Daubrecq and his bit of crystal!”
Lupin did not wait to arrive at these conclusions before settling his actions accordingly. At the moment when he was stating them in his mind, three days after the scene at the Vaudeville, he was sitting, dressed like a retired tradesman, in an old overcoat, with a muffler round his neck, on a bench in the Avenue Victor-Hugo, at some distance from the Square Lamartine. Victoire had his instructions to pass by that bench at the same hour every morning.
“Yes,” he repeated to himself, “the crystal stopper: everything turns on that.... Once I get hold of it....”
Victoire arrived, with her shopping-basket on her arm. He at once noticed her extraordinary agitation and pallor:
“What’s the matter?” asked Lupin, walking beside his old nurse.
She went into a big grocer’s, which was crowded with people, and, turning to him:
“Here,” she said, in a voice torn with excitement. “Here’s what you’ve been hunting for.”