Kathrin von Hagen runs an extremely successful guesthouse in the stylish Löwenberg Castle. Kathrin also has a passion that she pursues with dedication: writing. She would love to see her latest crime play on stage, but the publisher Thomas Brand, who is currently a guest in her hotel, doesn't think much of the work. Some of Kathrin's friends decide to help her by performing a key scene in the play on site and thereby prove to Brand that the play has dramatic potential. No sooner said than done: the castle's library is chosen as the performance venue and quietly decorated to create an atmospheric atmosphere...
