A British drama; A story about the French widow of an English soldier who offers her services to British Intelligence, sent undercover in Vichy France. This gripping, moving and grim fact-based melodrama is a daunting and vivid tale. Anna Nagle gives a brilliant performance, immersing herself in the role in the same way as many Method actors did in a later generation. Trevor Howard and Peter Ustinov are equally convincing. The film brings respect and patriotism to the telling, and although there is little mystery, the factual elements are sensitively handled for a true story.