The Sinful People of Prague (1968)

Appearing on the scene in the series of thirteen detective stories is the Prague underworld of the 1920s and 1930s. The trio of police inspectors hunting for criminals from petty thieves to murderers under the baton of police counsel Vacátko pull well together, and no sinner escapes them. But you won't escape either, as they will take you captive by their peculiar humor and perfect solutions of the cases with which they are confronted.