In the short story The Witness for the Prosecution, Romaine Vole (real name Romaine Heilger) posed as the wife of Leonard Vole. Romaine had been working as an actress in Vienna, and her true husband was committed to a madhouse.
Romaine is a cold woman that speaks to Mr Mayherne at the home she shares with Vole hearing the devotion Vole has for her makes her disgusted she thinks men as stupid, she reveals that she is married to another man who is in a Vienna Madhouse and that she is a actress and that if she was might contradict what Vole said. In the end she does testify as a Prosecuting Witness which means that Vole's fate is death as they have nothing to prove otherwise. Then Mayherne gets letters from a woman who claims due to Romaine's stealing her man resulted in her disfigurement.
At the court Sir Charles, the lawyer, confronts Romaine Heilger with the letters and she breaks down freeing Vole. However Mayherne speaks to her later on, he knew she was that woman due the same movement pattern she admits it and confesses Vole's guilt.
The character was later reworked for Christie's own stage adaptation.