Fran is a reserved, high school history teacher in a rut. Mim is an eccentric free spirit who believes 70 is the new 40. They are also mother and daughter and their relationship is not exactly easy.But when Mim reveals she is dying and wants to go on a road trip to tick items, one by one, off her preposterous bucket list, Fran feels that she has no choice but to come along for the ride. She has to learn to let loose and Mim has to learn to think of someone else for a change. Both of them have to make the most of the time they have left together and find a way to accept the fact that it will soon be at an end. But with Mim and Fran, tragedy always somehow ends up as comedy.
The irrepressible Mim celebrates turning 70 by writing a bucket list. Her reserved daughter Fran tries to make the effort, but new starts and openness are easier said than done.
Mim has a plan to fund her bucket list by selling the contents of a time capsule buried at her alma mater, Cambridge, but instead Fran learns a secret about Mim's past.
It's the night before cousin Pat's daughter Gemma's wedding. When she reveals she doesn't want to go through with it, Mim and Fran try to help her, making some important discoveries in the process.