Fortune Is a Woman (1957)

A better than average crime noir that features Jack Hawkins as an insurance investigator drafted in, on Christmas Eve, to investigate a fire at a country house. When he gets there he discovers an old flame (Irene Dahl) married to the owner (Dennis Price). When he dies in a second fire at the house, Hawkins suspects that she was behind it for the insurance cash, but she convinces him not and they marry and all seems straightforward until a blackmailer rears his ugly head and together they have to try to get to the bottom of things. Hawkins is good in this, he keeps it all tense and although the plot does trip over itself once or twice, a good supporting cast including Ian Hunter and Geoffrey Keen make this quite an intriguing mystery with plenty of red herrings to keep us hooked.