A Death in Diamonds

In the fourth installment of the series, set in 1957 England, amateur detective Queen Elizabeth II grapples with two murders in Chelsea while navigating the complexities of postwar diplomacy and suspicious courtiers. As someone close to her becomes entangled in the crimes, Elizabeth seeks the help of former codebreaker Joan McGraw to uncover the truth and protect the monarchy's reputation. With time running out and danger looming, the duo must unravel a web of secrets from the past.