Devon's doubts about his relationship reach a peak as his friends and family gather for his big wedding day.
Lane Hunter's victims and their families are outraged when she is released from prison; Bell is continually tortured by Lane's manipulation; a patient suffers as a result of Lane's dangerous treatments; Devon worries when he doesn't hear from Julian.
Conrad must diagnose a young woman who gets admitted after having extreme night terrors; Devon faces his first Halloween in the emergency room; Nic panics over her decision to bring her newly sober sister to Mina's epic annual Halloween party.
Conrad's attempt to surprise Nic with a Valentine's Day dinner is foiled; Mina and Devon distract themselves from Valentine's celebrations.
A nasty flu season is masking a terribly infectious disease; Chastain must race to quarantine and diagnose infected patients; Devon treats a lovesick patient who has flu-like symptoms; Conrad doubts whether Nic is prepared to take the next step.