Halloween is coming and Detective Gus Collier and his ghostly partner Dr. Sarah Allen receive an early scare when Sarah's incarcerated murderer, Jason Morgan, sends word to Gus that something truly evil will happen on the spooky holiday. Will the crime-fighting duo manage to find other seventh-sevenths to stand with them to prevent a hellish invasion? Time is running out for the citizens of the Pacific Northwest, and only Gus and Ghost can save the day!