Conrad works on a case involving an old medical professor of his who is experiencing disturbing hallucinations; Nic mourns the loss of a patient; Bell operates on a foreign ambassador.
Conrad unwittingly makes the situation more difficult when he defends Nic after she becomes a suspect in the investigation of Lily's death; during a low-risk procedure, Bell's patient catches on fire.
Mina is called upon to perform a surgery in order to save a young father's life after Atlanta is rocked by a catastrophic snowstorm; Devon shares an important life lesson.
Roland is offered a job as a high school counsellor; Denise makes a new friend; Joan informs her troops of her pregnancy.
Trevor returns home a hero but is conflicted, while Frank -- still in Iraq -- becomes worried about Denise's newfound independence.