The Windsor Knot by SJ Bennett

When a Russian pianist is murdered at Windsor Castle on the eve of her 90th birthday celebrations, Queen Elizabeth decides to do some investigating of her own, since it seems the authorities are on the wrong track. With help from her assistant private secretary, Rozie Oshodi, the Queen is able to uncover information that she can covertly use to help the police apprehend the killer. The Windsor Knot is a delightful mystery filled with lots of details about the Queen's everyday life and her relationship with her family. Hoping this becomes a series...