The first book in a highly original and delightfully clever crime series in which Queen Elizabeth II secretly solves crimes while carrying out her royal duties.It is the early spring of 2016 and Queen Elizabeth is at Windsor Castle in advance of her 90th birthday celebrations. But the preparations are interrupted 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 invol ...