For the young nun Charlotte, the strict convent life is not a limitation, but a liberation from her former life in the fast lane. When the cocky advertising professional Conrad gets stranded in her monastery on a business trip, she feels confirmed in her decision. The abbess Katharina as well as the storm-tested sister Hedi, however, see the uninvited guest as a gift from heaven. His marketing skills could help lead the monastery out of the red and thus avert an impending sale. Charlotte would rather look for a lost 18th-century bull which, according to legend, guarantees the existence of Sankt Lioba forever. Out of necessity, however, she agrees to work with the campaign maker. While Conrad is secretly pursuing other plans on behalf of his boss, he gets to know Charlotte better. When Conrad learns what the nun is looking for and has found in the convent, he begins to question his life.