The truth of murder is set in 1926 and tells the story of Agatha solving a real life murder, which in turn was inspired by her real life dissaperencs. Ruth Bradley tales on the title role and I feel she does a grand job and is believable. While Agatha is in a rute with writing a woman calls her to investigate a murder on a train, though not just any murder. Oh no it's a relation of Florence nightingale. Agatha with the help of a lady that's been investigating the case rallies the suspects in a house under false pretensions. It is here were the real investigation comes together and a rogue gallery of characters appear. It's a good film overall with a good cast and decent writing.
