Mark's sister Dora arrives in Los Angeles, and Mark is quickly reminded of why he was happy to not see her after so many years due to her bossy attitude.
Matlock and Julie head to the mountains in pursuit of a witness to the shooting of a woman's philandering husband; they learn the witness is connected to crime.
Matlock supports a D.J.'s claims that he had nothing to do with the death of a rival D.J., but he discovers the radio personality is not what he seems.
Matlock investigates the death of a police officer and discovers that an old friend from the force, dubbed "The Mad Hatter," is no longer the cop he used to be.
A woman discovers that a member of her crime buff group, the Real Murders Club, has been killed in a way that closely resembles a case studied by the group.
When librarian Aurora helps out her overworked real estate mother, she once again steps into a life or death situation with the discovery of two bodies.
An unsent letter is found in a bureau from a rummage sale on the same day a store is set on fire and the connection of these two clues could lead to a killer.