The title is the code names of two brothers who fought the German occupation of Denmark in the Resistance. The younger, Flame (Thure Lindhardt), was a confirmed anti-fascist who wanted an armed attack on the occupying forces. The married Citron (Mads Mikkelson) was his brother’s driver, and though less overtly political, eventually became as deeply implicated as he.  

Ole Christian Madsen’s film is what is known as fictionalised truth, researched for years and obviously an important story for his country. It makes an intriguing one for us too: the brothers’ immediate superior was very possibly a traitor, the attractive courier (Stine Stengade) whom the younger man falls for was a double agent and the Gestapo chief he was determined to kill (Christian Berkel) was a relatively decent man.

The twists and turns of the plot keep you on tenterhooks throughout, even if this competently made film sometimes looks as if it were shot in a Denmark depleted of ordinary citizens.

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The cast are always convincing and you get a palpable feeling that, in such circumstances, no one could trust anyone and violent death was just around the corner.