In the 1950s, a beautiful society lady, Gaby, lives with her husband Marcel, a wealthy industrialist, in a remote country mansion – along with her mother, spinster sister Augustine, teenage daughters Suzon and Catherine, and maids Louise and Madame Chanel. One winter’s day, Gaby returns to her house with her daughter Suzon to find that her husband has been murdered – he is lying dead in his bed with a knife in his back. Shocked, the women’s first thought is to call the police – but the phone line is dead and their only car has been put out of action. As snow builds up around them, the women find themselves marooned and at the mercy of the killer. Then, quite unexpectedly, Marcel’s estranged sister, Pierrette, makes a sudden unwelcome appearance. As the eight women strive to uncover the identity of the killer, old enmities resurface and bitter recriminations start to fly.