In Grace Arbor the solutions are by no means clear. Who's beneath the masks? That is the story of a bunch of highschool youngsters - all well-liked, good wanting, "almost certainly to succeed" sorts - who amuse themselves by pulling pranks on unsuspecting college students and lecturers. At their core lies a cruelty and shallowness which comes with the territory of privilege. One night time, a prank goes horribly flawed, an adolescent is killed, and the gang covers it up as a drowning accident however 5 years later, their lives are turned the wrong way up when a neighborhood is killed by a serial killer sporting a haunting Marilyn Monroe masks. Quickly, the gang are killed one after the other in manners mirroring the pranks they pulled in highschool. Is it revenge? Is it karma?