The year is 2016 and the queen is hosting a dine and sleep at Windsor Castle when a guest is found dead in one of the bedrooms. It appears the Russian pianist strangled himself. However, MI5 is convinced foul play was involved. When it appears the case is headed in the wrong direction, the queen enlists the help of her assistant private secretary, Rozie Oshodi, to go seek out the truth about the man's death. The Queen's investigation uncovers some puzzling clues.