Rubín má barvu krve.

Restorer Rauch, who lives in an unsettled relationship with his wife, is assigned to appraise a rare collection of antiques. When he is supposed to take the items to the commission, his wife borrows a car and secretly drives off with her lover to a cottage. During the trip, they are both shot. The investigation initially leans towards a love motive, but Rauch claims that the collection included a rare goblet with rubies, which was of immense value. And the goblet has disappeared...