Audrey, Reid, Emma, and Sadie have been best friends since they were fourteen years old. When Sadie tragically passes away more than a decade later, she leaves them each a note with her last wish: to complete the bucket list they made together on the night of their high school graduation.

Audrey and Reid haven’t spoken since the last time they ticked an item off that list. As they set out on a cross-country road trip and work with Emma to fulfill Sadie's wish, they're forced to confront their unresolved emotions—none of them good. But when Audrey goes through a devastating breakup, she finds an unlikely support system in Reid. Perhaps she’s been wrong about her all along.

As Audrey and Reid draw closer in ways they never thought possible, their last promise to Sadie takes them on a journey toward healing their broken friendship and discovering the love they’ve always had for each other.