In the original novel, the threatening letter writer is the dead man's first wife, not his brother. Part of the novel's plot revolves around whether the girl can inherit from the dead man's estate due to the possibility that their marriage was bigamous.
There are no courtroom scenes in this episode. In fact, Perry manages to avoid two trials for Josephine - her original slander trial against Addicks and her trial for the murder charge against her.
In rare form, Perry is shown in the opening shot and scene.
The last of four appearances in the series by Robert Foulk.