The film describes how the resistance fighter Per, modeled on Knut Haugland, operated an illegal telegraph station on the roof of the National Hospital in 1944 during the Second World War.[4]
^Iverson, Gunnar; Soderbergh Widding, Astrid; Soila, Tytti (2005). Nordic National Cinemas. London: Routledge. p. 120.
^Krawc, Alfred (1986). International Directory of Cinematographers, Set- and Costume Designers in Film: Denmark, Finland, Norway, Sweden (from the Beginnings to 1984). Munich: Saur. p. 546.
^Cowie, Peter; Buquet, Françoise; Pitkänen, Risto; Talboom, Godfried (1992). Scandinavian Cinema: A Survey of the Films and Film-Makers of Denmark, Finland, Iceland, Norway, and Sweden. London: Tantivy Press. p. 92.
^"Omringet". Norsk filmografi. Nasjonalbiblioteket. Retrieved May 24, 2022.