Isla is in her 60s, close to retirement and longing for a time when her life will become her own. So when her mother dies, leaving her nothing but a mysterious picture, she sets about on a road trip to try to uncover the truth behind the painting - and about her past. But, right at the last minute, she is forced to take her 14-year-old grand-daughter with her, and neither is particularly thrilled about the idea. Together the pair will uncover shattering truths about the past, and their journey will take them through the UK, and back in time to Paris in the 1950s, where the story really all began.