Karen, Sarah, and Emma Tunney are all moving to a small town in Pennsylvania where, unknown to them, in 1913, a horrid mine accident trapped dozens of children alive, underground. But there's a problem. They're still alive.
After being committed for 15 years, Michael Myers, now a grown man and still very dangerous, escapes from the mental institution and immediately returns to Haddonfield to find his baby sister, Laurie.
A year after an April Fool's Day prank which resulted in the death of one of their set, a group of friends find themselves targeted by someone who is out for revenge.