Christian has some ethical concerns about a patient's extreme surgical request; Sean uses his skills on a mother and her son in the Witness Protection Program; Julia, Gina and Liz manufacture a new signature product.
Don relies on Charlie's mathematical insight to help stop a deadly virus that may have been the product of an act of bioterrorism.
Sean learns the truth about Nikki's past and questions his feelings for her; Christian contacts the mother of a Down syndrome patient; Quentin shows interest in Julia.
Christian and Quentin's working relationship worsens; Sean's upset about losing Nikki to the Witness Protection Program; Christian gives Kimber a pre-nuptial ultimatum.