When cookie maker Katie White announces her plans to take over a number of smaller baking companies, any one of them could be the killer. After she dies from an allergic reaction to hazel nuts, Matlock defends cookie maker Bobby.

Matlock is planning a birthday fishing trip with Leanne, but when he is called up for jury duty it puts a damper on their trip. Despite his convictions that no lawyer would want him on their jury, Matlock ends up being juror number six, and while everyone else on the jury wants to convict Travis Spaulding of the murder of his wife, Matlock alone thinks they need to take a closer look at the evidence before sentencing the man to death. Unfortunately, tempers flare in the jury room as the jurors soon become divided between guilty and not guilty.