A local woman is murdered. The guests and staff at Monkswell Manor find themselves stranded during a snowstorm. It soon becomes clear that the killer is among them, and the seven strangers grow increasingly suspicious of one another. A police detective arrives and begins to interrogate the suspects.

When a second murder takes place, tensions and fears escalate. This record-breaking murder mystery features a brilliant surprise finish from Dame Agatha Christie, the foremost mystery writer of her time.