**Read the must-have Sunday Times bestseller today. GONE GIRL meets THE GIRL ON THE TRAIN in this stunning, unsettling psychological thriller.**A baby goes missing. But does her mother want her back?When Estelle's baby daughter is taken from her cot, she doesn't report her missing. Days later, Estelle is found in a wrecked car, with a wound to her head and no memory.Estelle knows she holds the key to what happened that night - but what she doesn't know is whether she was responsible...