When Isla, a 65-year-old grandmother, is left nothing but an old painting in her mother's will, while her sisters and aunt inherit the estate, she is devastated. Close to retirement, getting ready to live on her own terms, the last thing she expects at this time of her life is such turmoil. So, to find an explanation for her mother's rejection, she embarks on a road trip. But, right at the last moment, she's forced to take her sullen 14-year-old granddaughter Charlie with her. Cramped together in Isla's car with her smelly old dog, these ill-assorted travelling companions set off to uncover some shattering and life-changing family truths at the same time as learning to love each other?