As the sun sets, chaos erupts and the Bat-Family jumps into action to help the Signal (a.k.a. Duke Thomas) against the mysterious Gnomon and his minions. While his allies keep the battle going on the streets, Duke must go above and beyond to track down the malicious man who has single-handedly caused the dangerous boom in meta-activity in the Narrows. Little does he know, Gnomon holds the key to his past and the future of heroes in Gotham City!