Yes, right: even the ones among them who haven't read the book can agree that it's best kept out of Javert's hands. Feuilly nods at that. Best not to mention any of it to Javert, best not to make him wonder how they know.

But Bahorel's last information gets as startled an expression from Feuilly as he could ever hope. "Marius Pontmercy? Marius from the barricade? How--how did they come to meet?"

No, really, how. Feuilly is quite aware that abandoned and orphaned children sometimes survive and live well, against all the odds. But they don't generally happen to marry a man who was fighting at a barricade spied on by the man who killed their mother.