“The suspected individual” did indeed approach Javert thus disguised, and bestow alms on him. At that moment Javert raised his head, and the shock which Jean Valjean received on recognizing Javert was equal to the one received by Javert when he thought he recognized Jean Valjean.
However, the darkness might have misled him; Jean Valjean’s death was official; Javert cherished very grave doubts; and when in doubt, Javert, the man of scruples, never laid a finger on anyone’s collar.
He followed his man to the Gorbeau house, and got “the old woman” to talking, which was no difficult matter. The old woman confirmed the fact regarding the coat lined with millions, and narrated to him the episode of the thousand-franc bill. She had seen it! She had handled it! Javert hired a room; that evening he installed himself in it. He came and listened at the mysterious lodger’s door, hoping to catch the sound of his voice, but Jean Valjean saw his candle through the keyhole, and foiled the spy by keeping silent.