Bull agrees to help the parents of a former employee sue a drug company when their son commits suicide during a drug trial. However, the task is complicated when the company brings in their own trial scientist, Arti Cander.

As Christmas approaches, Bull is amused when he meets a 9-year-old girl who wants to hire him to help her divorce her parents, but he's shocked when a judge appoints him her temporary guardian. Also, Marissa discovers disturbing information about her boyfriend, Kyle.