Ehebruch - Eine teuflische Falle! (1996)

The successful advertising copywriter Lena is happily married to furniture designer Wolf, with whom she has a healthy little daughter Julie. When suddenly their holiday apartment blows up and she starts receiving loathing letters, she has no idea who's behind it - everyone seems to like her. So she starts mistrusting everyone around her and fears for her life and that of her baby daughter.