Three victims, three bullets, three cities. Simultaneous murders in LA, Chicago, and San Francisco, SFPD Sergeant Lindsay Boxer's jurisdiction. The shooters are precise, as is their target selection. Each one of the men and women downed excels at an illegal and deadly activity that is dominating public debate. As the casualty list expands, the fear and fascination with this shooting gallery galvanises the county. Are the shooter villains or heroes? And who will be next?