Sally has just moved into a Victorian house in London newly converted to provide a garden flat. She's a woman with an outwardly enviable life. Married to banker Edward and mother of two-year-old Louis, the family occupies the house's upper floors. Yet beneath an apparently happy exterior, Sally struggles with the legacy of Edward's past: his ex-wife Pia, a successful and high-profile writer, his resentful step-daughter Hope - and Edward's mixed feelings about the family he left behind. When Sally discovers the house holds a secret, her need to escape the strains of her marriage, coupled with a desire to use her brain, leads her on a quest to discover the truth. But can she solve the challenges of the present as well as the past?
While Sally struggles, Anna moves into the garden flat. Anna has always shunned domesticity. A driven workaholic and a highly successful television producer, ironically her new project is a reality show called 'Marriage Menders'. Digging beneath the surface of other people's relationships leads her to ask questions she has so far managed to avoid, about the importance of love, family and the ties of blood. When an error of judgement threatens her career and her love life, like Sally, she must choose the path of her future.