Based on the best selling novel by Colleen Hoover.  Lowen Ashleigh, hired to ghostwrite for best-selling author Verity Crawford, uncovers what appears to be Verity's autobiographical notes, and becomes involved in what may prove to be a lethal conspiracy.

An English school teacher (Ifans) and an American composer (Linney) meet at a hospital after both are diagnosed with Parkinson's disease, having been told they have "five good years" left before the disease consumes them. The film follows their journey of managing the disease while maintaining their quality of life and continuing doing things that bring them joy.