In the season finale well-known performance artist Afsoun Hamidi (guest star Aghdashloo) is admitted to the hospital, but when the team learns that her symptoms may have been self-inflicted as part of a documentary for her latest performance piece,
As the Cohens prepare for Kirsten's 40th birthday party, Kirsten gets some news that will change her life forever. Meanwhile, Julie is having a secret love affair-and Kaitlin is doing everything she can to stop it.
The Lightman Group investigates a murder case where a woman with multiple personalities (guest star Christensen) may either be a witness or the killer. Meanwhile, the President of the United States hires the firm to interrogate a potential Supreme Court nominee.
Cooper must decide whether or not to punish Mason after he is caught stealing; Pete and Violet struggle to split time with Lucas; Addison prepares for a new baby.
Christa must put aside her personal feelings for Grace and work with her to treat Brody, (Cameron Boyce), a patient who claims to have been abused at a camp for troubled teens. Also, Grace is surprised when Campbell asks her out.
