After Brian Martell is arrested and charged with the murder of Arthur Kendall, Matlock decides to get involved because, years earlier, his father Charlie had been a suspect in the murder of Arthur's father Jake -- a murder Brian's father Lee was convicted of. Brian is convinced that Matlock is doing it to make up for Lee spending years in prison for a crime that Charlie Matlock convicted, but Matlock swears neither man committed the crime. While investigating the murder of the playwright, their trail soon leads to the woman he was having an affair with, and her very angry son young son. (thetvdb.com)