Batman #10

In "Der Button, Kapitel 1," Saturn Girl, a patient at Arkham Asylum, makes a chilling prediction about a hockey player’s death. In the Batcave, Batman examines a mysterious smiley face button left behind by Wally West’s sudden appearance from the Speed Force, only to be haunted by a vision of his father as the Batman from the Flashpoint universe. When Flash arrives to help, Professor Zoom arrives first—attacking Batman before seizing the button and vanishing, only to reappear moments later, dead.

In "Der Button, Kapitel 2," Barry Allen investigates the mysterious death of Professor Zoom, uncovering a chilling link between the killer’s remains and the same radiation tied to the smiley face button that appeared in the Batcave after Wally West’s return from beyond time. With an injured Batman by his side and the Cosmic Treadmill at their disposal, Barry and the Dark Knight race through time to follow the trail, chasing a truth that stretches across dimensions and echoes through the past.