Veteran Detective Rex Braden has worked many murder cases in the city of Rock Valley, Colorado, a peaceful city at the foot of the Rocky Mountains, for over ten years. He is a "caffeine addict by day with a few whiskeys at night" sort of guy. In Rock Valley, a serial killer is a rarity. However, a gruesome series of murders takes place, each seemingly linked to the others. Braden and his partner, Jason Martin, must scramble to make sense of clues that don’t add up. When a suicide is connected to the current murders, not only will Braden have to stop the darkness taking over the city, but also that which seeks to darken the past.