Mirelle

In the novel The Mystery of the Blue Train, Mirelle is a Parisian dancer at Parthenon. She is the lover of Derek Kettering. She is described as a "beautifully made woman. Her face, beneath its mask of yellow, had a bizarre charm of its own".

She lives in an Eastern themed flat in Paris.

Mirelle exposed her lover Derek as the murderer of the case. However, this wasn't true, and she only exposed him because he had fallen in love with another woman.

Portrayals
In the 2005 ITV Agatha Christie's Poirot episode based off The Mystery of the Blue Train, she was portrayed by actress Josette Simon. Here, we are given her last name too: "Mirelle Milesi". In the original novel her last name isn't given.