I initially misread the title of this film as "Sarah Keays" and thought I was in for a steamy account of sex, adultery and betrayal in the inner circles of Margaret Thatcher's government in the early 1980s. It is in fact a version of a bestselling French novel with a complex narrative, linking the lives of a Jewish family, brutally arrested by the French police in 1942 Paris on behalf of their German masters, and an American journalist (Kristin Scott Thomas) married to a dodgy Frenchman and researching an article in 2009 on the treatment of French Jews. Thomas is good as always. There are grimly convincing recreations of the appalling conditions in Paris's V�lodrome d'hiver where the Jews were incarcerated on the first stage of their journey to extermination camps in the east. The story, covering some 60-odd years in Paris, New York and Italy, is inevitably both affecting and shocking. But it is altogether too busy and complicated a narrative, the makers apparently mistaking confusion for complexity.