A famous, liberal lawyer hijacks Diane and Alicia’s latest case; when Alicia’s mother (Stockard Channing) visits fro Thanksgiving, she seeks legal support.

Joan discovers an unsolved murder connected to a rare prehistoric fossil when she reviews one of Sherlock’s cold cases; Sherlock’s responsibilities as a sobriety sponsor cross personal boundaries.

Two engaged scientists die in a fire and their mentally challenged neighbor is injured while trying to help them. The detectives discover that the couple was stabbed before the fire…