"The Death of Black King" (the title devises both to chess play and to murder of Mr Král (in English King)) is the last of four movie-continuators of TV series Sinful People of Prague, the famous cycle of mysteries from the first decades of Czechoslovakia. In this full-length movie criminologists investigate strange murder of "debt-collector" Král. The crime is complicated - there are many suspicious and many other lesser serious misdoings (e.g. defalcation in factory where Mr Král works). The story takes place in Prague periphery and it is a place of anomalous and curious people with dark and painful fates. This demimonde has great charm which is accented by the perfectly voted locations (this old Prague have not existed yet). The performances are great again and the music by Zdenek Liska is wonderful.