When Matlock's new neighbor, Les 'Ace' Calhoun, is charged with murdering the used car salesman who sold him a lemon, Matlock takes the case to prove that more than one person had a motive, and that Les is not the guilty party.

Anthony Stewart is charged with murdering Michael Russell, the husband of the woman he was sleeping with. Although Stewart, a visiting British ambassador, has diplomatic immunity, he refuses to use it, and wants to clean his name. Matlcok agrees to defend the young ambassador, but his case is almost over when Stewart is nearly killed in a hit and run.

Seven years earlier Ken Wilson was sent to prison, convicted of murdering his wife, Ann. After he's released, he runs into his wife in Los Angeles, only now she's going by the name Kelly Manning. When she turns up dead, Ken Wilson is again arrested and charged with her murder. Ben is determined to prove that someone else killed the woman. Back in Atlanta, Les is thrilled about his new relationship with Bernice, a woman he met at Ray Templin's.

When a scrooge of a store owner is accused of murdering his partner for being 'good' at Christmas, Matlock agrees to take the case, but Steven Abbott is furious when part of Matlock's fee involves Abbott having to be a 'good' guy.