In a suburban villa, a woman of means is murdered. Police Superintendent Zdychynec (
Vladimír Mensík) from the Prague Liben neighborhood reports the case to Police Councilman Vacátko (
Jaroslav Marvan), upon whose order an investigation is launched immediately. Zdychynec begins to suspect the wooer of his own daughter, a handsome dragoon named Rudi (
Josef Abrhám), of the crime. In Rudi's absence, Zdychynec searches his rented room in the apartment of the elegant Mrs Dragicová (
Kveta Fialová). All his findings - among others, sand left on Rudi's jackboots and a decent amount of money in his bedside table - convince the superintendent that he is following the right lead, especially when Rudi refuses to say where he was at the time of the murder.
—NFA.cz