The story begins as Johnny Garland, a young, 16-year old detective who lost his father, sister and his memory in an accident, accepts an investigation to track down a criminal suspect who escaped from custody. As he closes in on the suspect, Johnny witnesses a supernatural occurrence - a huge monster appears from a green light known as the "window" and swallows up the criminal. Apparently, a series of horrific incidents similar to this have been plaguing the cities across the nation. Johnny's female counterpart is 21-year-old bounty hunter Shania, a Native American who is searching for these mysterious windows and determined to fight them using her spiritual powers. Together, they travel around the states and are joined by other characters.