The Case of the Black Cat

Lawyer Perry Mason arrives at the Laxter mansion late one night to amend invalid Peter Laxter's will, ensuring his granddaughter Wilma is disinherited and cannot marry the suspected gold-digger Doug. After a mysterious fire claims Peter's life, his grandsons, Sam and Frank, inherit under the condition that the old caretaker Schuster and his cat Clinker remain. As tensions rise, especially from cat-hating Sam, Perry uncovers a web of deceit, leading to Schuster's murder and a trial against Doug for another killing. A shocking witness emerges, dramatically altering the case's trajectory.