Inside (À l’intérieur) is a brutal French New Extremity horror film where a pregnant woman, grieving and alone, is hunted inside her own home by a relentless intruder. This shocking home-invasion nightmare is infamous for its extreme violence, claustrophobic tension, and disturbing atmosphere, making it one of the most notorious modern exploitation horrors.

Following the death of her husband, an expectant mother is tormented in her home on Christmas Eve by a strange woman who wants her unborn baby.

Från IMDB:
Four months after the death of her husband, a woman on the brink of motherhood is tormented in her home by a strange woman who wants her unborn baby.