The Poisoner

The Poisoner or Marie Besnard, l'empoisonneuse is a 2006 French-Belgium drama television film directed by Christian Faure. It stars Muriel Robin as Marie Besnard and it was broadcast on TF1 in 2006.
Plot.
In 1947, in Loudun, Mary and Leon Besnard celebrate with their friends, eighteen years of marriage. Marie surprising gestures moved between Leo and her best friend, Louise. Soon after, Leo gets sick and dies. Louise confided to a friend that Leo was convinced he was poisoned by his wife. In Paris, Simone Roulier, a trainee journalist, decides to cover the case.