After a nightmare shift in A&E during which a patient dies, experienced Doctor Lucinda Edwards faces an investigation into her fitness to practise.

The inquest into the patient's death uncovers shocking new information which raises questions for both Lucinda and the Medical Investigation Unit.

George and Norma must decide if they can trust Lucinda as her search for the truth becomes dangerous and she turns to help from unexpected places.

When psychiatric registrar James Ford finds himself torn between a new mother attending a routine postnatal check-up and the sectioning of a psychotic woman during a busy on-call shift, no-one can predict the terrible consequences. The MIU are brought in to investigate, but digging deeper into the events that night leads to questions about Dr Ford and his hospital department.

The MIU turns the spotlight on Dr Hernandez and the obstetric department in the wake of Maria Carter's evidence, but the team suspects wider cultural issues when the hospital's trust question the investigation. Meanwhile, a rattled Ford unravels when he discovers new information and leaves Kate concerned with his behaviour, and a shocking secret risks exposing the doctor's lies