"The first book in a highly original and clever new crime series featuring Queen Elizabeth II as an amateur detective who solves crimes in secret and behind the scenes, in between her royal duties"-- Provided by publisher.

Spring, 2016. Queen Elizabeth is at Windsor Castle in advance of her 90th birthday celebrations. When a guest is found dead in one of the Castle bedrooms, the scene suggests the young Russian pianist strangled himself, but a badly tied knot leads MI5 to suspect foul play was involved. Unhappy at the handling of the case and concerned for her staff's morale, the monarch--with help from her Assistant Private Secretary, Rozie Oshodi, a British Nigerian officer recently appointed to the Royal Horse Artillery--begins making inquiries to bring a murderer to justice.-- Adapted from jacket.