The Wuppertal private detective Remigius Rott has finally landed a pleasant job: In exchange for free accommodation and a decent fee, he is to watch over a friend's house in Wülfrath. But then everything changes: During a riddle rally through the Bergisches Land, he stumbles upon a corpse near the Altenberg Cathedral together with the mysterious Yvonne. Rott quickly finds himself in the midst of a case that demands a lot from him not only as a detective: the likable private investigator from Wupper is head over heels in love.