Some people attach their hearts to trivial novels, while others are more interested in medieval psalms on parchment. Yet, these can hold strange secrets, such as Ovid's "Art of Love," illustrated with a pornographic attention to detail. Detective Bettina Boll doesn't really believe that the hastily set up "Soko Ovid" will actually be put to use, and she is just a part-time worker with two children. However, when the house of a harmless old lady goes up in flames, the BKA starts asking questions: Where is the sender of the anonymous postcard with the Latin saying? Who could have slipped the package with the bomb to the suspicious widow? And what intentions does Gregor Krampe, the likable chain smoker with the dark gaze who knows so much about books, actually have? Then Bettina Boll gets her big chance in the federal police.