I've seen the letter several times. The first time I saw it, I was shocked at the opening scene, when Mrs. Crosbie repeatedly shoots and kills this man: first, the use of light and darkness, and the people sleeping, and the quiet night, once again pulls you into a sense of false security, and then the gun shots, secondly; the clouds passing in front of the full moon covering up and then revealing the crime and the look on Mrs. Crosbies's face, her whole demeanor, revealed to me that there was more to this than just self defense; this woman had a motive....