October 1940. Livvy Redmond is thrilled to receive an invitation to a country house party away from the Blitz. There she hopes to help her husband overcome his injuries from fighting in France. But excitement turns to horror when she stumbles across two members of the house party - murdered.

Indebted to her hostess, Livvy attempts to catch the killer. No one is who they seem, and the party goers leave her with more questions than answers.

Somewhere close, the killer waits in the shadows to stop her.