Final episode in this nail-biting BBC medical drama which stars upcoming Doctor Who Jodie Whitaker as a nurse who decides to pretend to be a doctor in a Scottish hospital - what can go wrong? Plenty, as you have probably already seen. In tonight's finale, Ally must deal with the consequences of what happened last week with Andy telling her that during the investigation, she will have to sacrifice Brigitte in order to save herself. Meanwhile, desperate to prove himself, Karl arrives in Edinburgh, but could he blow Ally's cover?