Arthur worries he has ruined his career and irreparably damaged his relationship with Morven as he returns to work, and it quickly becomes clear he will have to acknowledge a few painful truths if he is to earn his place back in AAU. Meanwhile, Ollie's interference leads Mo to believe she is being taken advantage of by Zosia, and Guy must overcome his crisis of confidence as he tries to save the life of a boy with a critical neurological condition.