It is the nightmare of every community—a school shooting. In 2001, When a disturbed teenager masterminds this terrible event, everyone in River City is plunged into the darkness that surrounds it. The students and teachers try to survive, and the men and women of RCPD try to save them. But when things go horribly wrong, everyone seems to be looking elsewhere for someone to blame. Officer Katie MacLeod is among many who discover that the nightmare doesn't end when the shooting stops.