Eine Handvoll Briefe 2014 on netflix

Kristin turns 40. She is an attractive single woman who works in her profession, has a relationship with her boss and is somehow alone. Her best friend since childhood, Lenny, gives her a surprise suitcase for her birthday. For years, unclaimed suitcases are auctioned off at the airport without knowing the contents. Lenny bought one of these suitcases for Kristin. Of course Kristin is curious and finds in this suitcase, which must have belonged to a woman, a bundle of love letters. More and more she falls for these letters and the unknown who wrote them.