Bull gets to work alongside his idol, Walter Franklin, a legendary lawyer who asks him to help a family bring suit against the U.S. government for the wrong death of a man killed while in witness protection. As the trial gets underway, Bull’s admiration for Walter is tested when the eminent litigator begins to deviate from Bull’s advice in court.

TAC braces for an un-jolly Christmas when Bull and Benny represent Marissa and her estranged husband, Greg, in federal court after they're charged with money laundering and fraud connected to Greg's restaurant. As Bull and Benny defend the divorcing couple together so the prosecution can't use them against each other, they search for jurors who will believe Marissa had no knowledge of Greg's business dealings. Also, as Bull and Izzy prepare to baptize Astrid before the Christmas holiday, they reach an impasse regarding what they want from their renewed relationship.