Sitting in the Marriot pool bar in San Diego, I get the word. But it is a semi-spoilery word, for tomorrow's Justice League #42. So spoilers on from this point, be warned.

We have recently seen Lex Luther learn Batman's identity.

We have had the world learn Nightwing and Superman's identity.

Well tomorrow it's time for Batman to learn the identity of… The Joker.

And he's not a stranger. He means something to Batman. Something personal… and impossible.

So who is the face behind the crooked smile? That I'll have to wait to discover…