"Agreements--yes, that's a sensible enough principle," Combeferre says, thoughtfully.

He snorts at the idea of Javert doing anything out of sheer curiosity. "Well. Perhaps, if he believed some of us were, oh, plotting revolution, or doing something else of interest to him, in the Labyrinth...that could draw him there, of his own volition. Though as you say--we'd likely face the cells for the deception anyway."

Even if the cells aren't much to face.