One ordinary morning, Norah walked out of her house on Willoughby Street and never looked back. Six years later, she returns to the home she walked away from only to find another woman in her place. Fay held Norah's family together after she disappeared, she shares a bed with Norah's husband and Norah's youngest daughter calls Fay 'Mummy'. Now that Norah has returned, everyone has questions. Where has she been? Why did she leave? And why is she back? As each member of the family tries to find the answers they each need, they must also face up to the most pressing question of all - what happens to The Mother Who Stayed when The Mother Who Left comes back? From the author of What Milo Saw, comes this powerful, emotional and perceptive novel about what it takes to hold a family together and what you're willing to sacrifice for the ones you love.