Russo Brothers share mysterious photo from ‘Avengers 4’ set

The Russo Brothers drove fans wild on social media this morning with a behind-the-scenes photo from the set of Avengers 4. Joe Russo is pictured in the black and white photo, which was accompanied by a caption reading “Look hard…”

Anyone hoping to see the title of the film in the mysterious image probably won’t get what they’re looking for. There are, however, four “A’s” in the photo (as spotted by the Twitter user below). Get it? A4 = Avengers 4.