Planted at the top of the central police station and closely controlled, it only lights up in the event of extreme emergency, when the situation exceeds the powers and means of the police. So the vigilante of the night, Gotham's protector Batman, comes out of the shadow to assist the police. But many who have sworn with their badge and weapon, prefer to leave the bat-signal extinguished, and solve the problems of crime without resorting to a masked vigilante who does not answer before any authority. However, in Gotham City, a city infested by criminals with superpowers such as the very dangerous Mister Freeze, the life of a policeman is not a sinecure.