When Sir Wilfrid speaks with Leonard's German wife Christine, he finds her rather cold and self-possessed, but she does provide an alibi, although by no means an entirely convincing one. Therefore, he is greatly surprised when, at the end of the trial, she is summoned as a witness by the prosecuting barrister. While a wife can not be compelled to testify against her husband, Christine was in fact still married to Otto Helm, a German man now in an insane asylum, when she wed Leonard (who was in the Royal Air Force and part of the occupation forces in Germany at the time, and married her to help her escape Germany). She testifies that Leonard admitted to her that he had killed Mrs. French, and that her conscience forced her to finally tell the truth.