“Come along, then!” said Braith to the others, and hurried them away.

Rex sat still till they were out of sight, then he got up and turned into the Avenue de l’Observatoire. He stopped and drank some cognac at a little café, and then started on, but he had no idea where he was going.

Presently he found himself crossing a bridge, and looked up. The great pile of Notre Dame de Paris loomed on his right. He crossed the Seine and wandered on without any aim—but passing the Tour St Jacques, and wishing to avoid the Boulevard, he made a sharp detour to the right, and after long wandering through byways and lanes, he crossed the foul, smoky Canal St Martin, and bore again to the right—always aimlessly.

Twilight was falling when his steps were arrested by fatigue. Looking up, he found himself opposite the gloomy mass of La Roquette prison. Sentinels slouched and dawdled up and down before the little painted sentry boxes under the great gate.

Over the archway was some lettering, and Gethryn stopped to read it:

La Roquette
Prison of the Condemned

He looked up and down the cheerless street. It was deserted save by the lounging sentinels and one wretched child, who crouched against the gateway.

“Fiche moi le camp! Allons! En route!” growled one of the sentinels, stamping his foot and shaking his fist at the bundle of rags.

Gethryn walked toward him.

“What’s the matter with the little one?” he asked.