Q:I am a movie director and I just received the following movie plot. Could you help me answer this question? If not, let me know by writing "Not answerable". Plot title: Madame X Movie plot: A woman is thrown out of her home by her jealous husband and sinks into depravity. Twenty years later, she finds herself accused of murder for saving her son, who does not know who she is. He finds himself defending her without knowing her background. My question: What letter did she sign the confession with?
A:
Not answerable