Rider in Blue

Rider in Blue is a 1959 Swedish mystery thriller film directed by Arne Mattsson and starring Annalisa Ericson, Gunnel Broström and Bengt Brunskog. It was shot at the Centrumateljéerna Studios in Stockholm and on location at Bromma Airport and Strömsholm Castle. The film's sets were designed by the art director Bibi Lindström. It was the third in a series of five films featuring the husband and wife detective duo John and Kajsa Hillman. It was followed in 1962 by The Lady in White, the fourth film in the series.

Synopsis from Wikipedia, CC BY-SA 4.0. Everything below written here.

Poster © the film's rights holders.