It has now been 4 years since the events of Murder After Dark part 2. For Detective Stockwell he is still struggling to find a new normal. In these last four years he has developed a close friendship with former suspect Cecilia Ray who wants more than just friendship. Meanwhile, hidden within the trees deep in Harber Woods, a blood thirsty killer waits patiently. Waiting for the moment his next victim will appear. Just as Stockwell is feeling comfortable a new horror emerges. On a crisp autumn day, just days before Halloween, four friends go out into the woods for a hike only to go missing.