"And it's enough of a game-changer that you don't want to discuss anything else until I've seen it. More so than Commissioner Gordon, even."
"Mm. You came alone," he says. "Didn't try to dodge when I found you out. Clearly you have decided to trust me. Only polite to do the same. And, of course..." He lets the sentence trail off, quirking an eyebrow.
"...now is not the time to screw around?" she finishes for him. "I see what you mean. Thank you for being so willing to share your resources with me. I think we will be able to work together more easily than I was expecting."
"I... found out a few things about what happened to Batman. Stumbled across the Joker's message while I was at it. Decided to meet him and see if there was any chance he could help. Seems like there's a pretty big chance."
"He went to confront Bane and never came back."
And his name is Bruce Wayne. But that, much more than the rest, is emphatically not John's secret to tell.
John watches her go, then looks over at the Joker. (When did he stop keeping half an eye on the Joker at all times?)