A human hand and a bag of drugs are found washed up, separately, 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? And who is the next victim?