Showing Little Face by Sophie Hannah

She's only been gone two hours. Her husband David was supposed to be looking after their two-week-old daughter. But when Alice Fancourt walks into the nursery, her terrifying ordeal begins, for Alice insists the baby in the cot is a stranger she's never seen before.

With an increasingly hostile and menacing David swearing she must either be mad or lying, how can Alice make the police believe her before it's too late?