Bull needs a Christmas miracle when he takes on a sports agency’s young assistant charged with providing a star client lethal drugs.

Bull helps an agoraphobic client bring a wrongful death suit against the alleged killer of his beloved aunt, but the client’s inability to testify in person threatens the trial. Also, Taylor forges a connection with TAC’s agoraphobic client, and Chunk’s new relationship hits a snag when his mother, Adaline, visits.

Bull and Izzy experience marital discord when Bull has TAC lead the defense for Diana Lindsay, his ex-girlfriend who’s accused of killing her lover’s wife. Also, personal conflicts abound for the TAC team when Chunk finds himself defending Diana in court against his boyfriend and prosecutor, Robert.

When Bull handles the negligent homicide defense of a building owner accused of killing tenants by carbon monoxide poisoning, the case rocks Bull and the TAC team to their core. Also, TAC’s trial defense is made more difficult when the ADA prosecuting the case is Chunk’s ex-boyfriend, Rob Jones, someone very familiar with Bull’s tricks; and Taylor is forced to reevaluate her work-life balance when she gets shocking news about her son.

Bull and the team head to court one last time to finalize a negligent homicide defense that will change the nature of their company and their lives forever.