Murder most royal

Christmas at Sandringham is going to be murder. A human hand and a bag of drugs are found washed up on a beach next to the Queen's estate at Sandringham. The Queen identifies the 70-year-old victim, Edward St Cyr, from his signet ring. But the search for his killer is not so straightforward. Suspects include the Queen's horse groom, a shady land agent, an aristocrat neighbour, as well as the victim's many cousins and relations. The investigation leads the Queen - and her trusted assistant, Rozie - to a local pigeon racing club, back to London, and to the ancient, moated Godwick Hall. But how do the seemingly disparate pieces of the puzzle fit together?