The reason for Karl-Arne Holmsten's very minor role in this is that he got sick when the shooting was about to start, forcing Folke Mellvig and Lars Widding to quickly rewrite the script.
Ewa Strömberg's debut.
This is one the of films in a pentolgy of the Folke Mellvig/Lars Widding murder mystery stories , the 5 films being : The Lady in Black 1958, Mannequin in Red 1958, Rider in Blue 1959, Lady in White 1962, and The Yellow Car 1963