"Left me gasping. Brilliant." --Alex Michaelides

"Has one of the best story twists I have ever read...superb writing." --Ruth Jones

"Resonates long after you turn the final page." --Rosamund Lupton

When Anna Bradshaw wakes up in a hospital bed in London, she remembers nothing, not even her loving husband, Stephen. The doctors say her amnesia is to be expected, but Anna feels cut adrift from her entire life.

In Bristol, Livvy Nicholson is newly married to Dominic and eager to get back to work after six months' maternity leave. But when Dominic's estranged mother appears, making a series of unnerving claims, Livvy is sucked into a version of herself she doesn't recognise.

A hundred miles apart, both women feel trapped and disorientated, and their stories are about to collide. Can they uncover the secret that connects them and reconstruct their fractured lives?