On a balmy Tuesday afternoon, Detective Albert Amos finds himself face-to-face with an elderly woman that seems to be a bit of a nut. Eighty-year-old Lorna-Mae Johnson is absolutely adamant that her nephew, Devin Johnson, was murdered on Halloween night in 2012. Amos, a nineteen-year veteran of the police force, and a purveyor of practicality, isn't convinced. Devin's disappearance was investigated, and it was concluded the boy skipped town after receiving an eviction notice from his landlord. However, Lorna-Mae brings with her an anonymous note left in her mailbox she believes is from Devin's killer. The note insinuates more violence to come this Halloween and is signed with a bizarre insignia. With his interest somewhat piqued, Amos visits the boy's former apartment and discovers the same strange symbol on the wall. It's drawn in blood. After some digging, Amos uncovers evidence of a disturbing trend: In five-year increments, a young man departs his home on Halloween and vanishes into the night. With the aid of his spunky partner, Stevie Hutchins, Amos chases the mysterious figure who has promised more bloodshed, knowing time is running out for the next target in the killer's crosshairs.Coby Conner is as normal as normal comes. Average height, middling student, and hopelessly infatuated with a girl who has zero interest in him. The boy is a quintessential high school senior. However, on the morning of Halloween, his sense of normalcy is interrupted when he receives a mysterious phone call. On the other end of the line, a warped voice tells him that death comes for him at nightfall. After the call, Coby begins to notice a series of eerie happenings. A tall man watches him from afar. A nondescript pickup truck flashes its lights in a parking lot. The abnormalities continue throughout the day, and Coby soon realizes he's being stalked by a horrifying figure that calls himself The Wolfmask. The deviant's murderous intentions aren't kept secret for long, and Coby's plan for Halloween becomes patently simple: Try to survive the night.