Bella Siatidis

In Témoin muet, the French adaptation of Agatha Christie's Dumb Witness for the TV series Les Petits Meurtres d'Agatha Christie, Bella Siatidis is the parallel character of Bella Tanios from the original story. In this adaptation Bella and he husband Georges Siatidis are not visiting from overseas. They live with Bella's aunt, the wealthy old lady Émilie Longuet, the Emily Arundell parallel. George is a manager working for the textile mill owned by Émilie. Bella is portrayed by Isabelle de Hertogh.

Bella is portrayed as slightly unstable. She sees frequent hallucinations of her dead daughter Sophia Siatidis. Bella's husband is seen regularly giving medications to her. He reveals later that he has been doing this to look after her and prevent her being sent to a mental hospital.

Like the Bella from the original novel, Bella killed her aunt Émilie. The method is the same, using white phosphorus. She later killed Daisy the maid because she was a possible witness, or rather, during a seance, Daisy appeared to have a communication from Émilie saying that she had been murdered. In this case, Bella used a golf club. An important lead in the investigation is when Laurence discovers that Bella was a nurse during the last war. She would know how to handle white phosphorus, which, according to him, needed special precautions.

Bella's motive for killing Émilie in this adaptation is less to do with money than for revenge. Like the rest of the family, Bella intensely disliked Émilie. She blames her for driving her mother, Émilie's sister, into a mental hospital. She also blames Émilie for beating her daughter Sophia, and driving the young girl to commit suicide.

Unlike Bella from the original novel, Bella here is not arrested. When Laurence arrives at the truth, Bella throws herself from a high window and commits suicide.