When Clark Griswold dies just days before Halloween, his grieving grandson gathers the family at the old Chicago house for his funeral…and vows to deliver one final, over-the-top Griswold Halloween.

Determined to salvage the magic of his children’s childhood and shield his family from grief, he sets out to prove he’s worthy of the Griswold name…until spectacle spirals into chaos, forcing him to accept that legacy isn’t something you recreate…it’s something you carry forward.