Batman and Flash team up to discover the mystery of the button.
Since Rebirth started, we have been in the dark about why a button was in Batman's cave. Now we will get the combined minds of the greatest detectives in the DC Universe to finally solve the mystery of the missing memories and the button we all know to be the Comedians button from The Watchmen. If you're as curious as we are, come in and check out issue #21 of Batman! And, if you're as hyped as us, add Batman #22, Flash #21, and Flash #22 to your pull and hold so that you wont miss a single issue of this action packed crossover event! Don't worry if you've fallen behind or haven't been keeping up with the Batman and Flash titles. This connects directly to the DC Rebirth one shot that introduced the start of rebirth!