Bull returns to work following his heart attack with a new rich client for the firm to represent: an insurance company being sued by a dying mother for denying coverage of her liver transplant.

Business becomes personal for Bull when TAC assists with a civil suit against the bank that funded the terrorists responsible for Cable's death. Also, Marissa enlists her former homeland security co-worker and international banking cyber-investigator, Taylor Rentzel, to help with the suit.

Bull and the TAC team help one of their own when Marissa’s restaurateur husband, Greg, is charged with involuntary manslaughter after one of his employees dies in a kitchen fire allegedly caused by negligence. During voire dire, Bull and Benny aim to select jurors who will believe the fire was an accident and not a pattern of irresponsible management.

Bull and the TAC team represent a teen boy raised in complete isolation when the young man goes on trial for murder after engaging in a deadly shootout. As the trial gets underway, Bull looks to select jurors who believe his sheltered client acted under the misguided influence of the only other person he has ever known, his survivalist father.

Bull works to convince a jury that an alleged murder was actually a tragic accident when TAC represents a woman charged with her 3-year-old stepdaughter’s death.

As Bull prepares for fatherhood, his work at TAC suffers without his top attorney, Benny, who quit in reaction to Bull’s romantic reconnection to his ex-wife and Benny’s sister, Isabella. In addition, the team faces a difficult time in court as they mount a defense for a young bartender on trial for involuntary manslaughter.

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.