This gripping, atmospheric crime thriller from Austrian-born director Paul Stein stars Oscar nominee Raymond Massey as a man at the centre of a multiple murder investigation – a case that sparks a sensationalist press frenzy when it becomes clear that the killer only strikes when there is a full moon.

During the First World War, Russian officer Ignatoff, wounded, falls in love with his nurse, Natasha. But she is subject to an upcoming marriage of family convenience to Brioukow, a wealthy industrialist of peasant stock. Brioukow is unjustifiably jealous, since Natasha has not betrayed him. He forces Ignatoff into his debt as a means of humiliating him. When Ignatoff's new friend, Madame Sabline, offers to pay his debt, preventing his ruin, Ignatoff comes quickly to realize that Madame Sabline has an ulterior motive, one that could prove dangerous to more lives than just Ignatoff's.

After discovering that she has only a short time left to live, concert pianist Lissa travels to Cornwall for the final fling of her life. While there, she falls in love with young mineral prospector Kit, a man whose dark secret prevents him from fighting in the War. Unbeknownst to Lissa, however, Kit's affections are also much in demand from a rival of hers.

Wartime thriller with film noir elements based on a true story as written in A.P. Scotland's autobiography "The London Cage". The plot has greatly exaggerated the actual events of A.P. Scotland's experiences, including the addition of a fictional love interest.