A grieving daughter discovers a red envelope from her mom that contains a final request: for her to complete a Christmas Checklist of twelve activities before Christmas, the last one being “Find Love”.

An 18th birthday mushroom trip brings free-spirited Elliott face-to-face with her wisecracking 39-year-old self. But when Elliott’s “old ass” starts handing out warnings about what her younger self should and shouldn’t do, Elliott realizes she has to rethink everything about family, love, and what’s becoming a transformative summer.