A police detective finds herself at the centre of the most dangerous case of her life when she is seconded on to the investigation into the murder of a drugs trafficker. What nobody around her knows is that she is the missing witness that the police and the killer are searching for.

A chronicle of the lives of the aristocratic Crawley family and their servants in the post-Edwardian era—with great events in history having an effect on their lives and on the British social hierarchy.