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.

Pressure mounts on Dr Ford as the investigation continues and when another traumatic incident occurs in the unit, he clashes with colleagues and the hospital's trust and leaves the future of the unit in doubt. Meanwhile, the MIU continue to dig into the events leading up to the incident and as they uncover discrepancies and questions, new evidence further undermines James' fitness to practice.