After a car accident in which her passenger, Marissa, dies, June Parker finds herself in possession of a list Marissa has written: "20 Things to Do by My 25th Birthday." The tasks range from inspiring (run a 5K) to daring (go braless) to near-impossible (change someone's life). To assuage her guilt, June races to achieve each goal herself before the deadline, learning more about her own life than she ever bargained for.
