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Things soon get a whole lot worse, though, when a huge train derailment calls everyone into work – and it’s all hands on deck as casualties arrive thick and fast. Good job there’s a former military doctor on hand to take control and turn AAU into something resembling a trauma base in a war zone. Bernie is in her element, but seeing an injured son and his devoted mum makes her think about what her brilliant career has cost her. With the kids siding with her husband in the bitter divorce, Bernie must ask herself some hard questions about what kind of mother she’s been.