Her Majesty the Queen Investigates

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 involved. The Queen leaves the investigation to the professionals—until their suspicions point them in the wrong direction. Unhappy at the mishandling of the case and concerned for her staff's morale, the monarch decides to take matters into her own hands.

At Buckingham Palace, the autumn of 2016 presages uncertain times. The Queen must deal with the fallout from the Brexit referendum, a new female prime minister, and a tumultuous election in the United States—yet these prove to be the least of her worries when a staff member is found dead beside the palace swimming pool.

Queen Elizabeth II is looking forward to a traditional Christmas gathering with her family in Sandringham when a shocking discovery interrupts holiday plans. A severed hand has been found—but even more unsettling, she recognizes the signet ring still attached to a finger. It belongs to a scion of the St Cyr family, her old friends from nearby Ladybridge Hall. Despite the personal connection, the Queen wants to leave the investigation to the police—that is, until newspapers drag her name into the matter.

Young Queen Elizabeth II is finding her way in postwar Europe, trying to repair friendships with foreign governments. Advised by her father's old courtiers, the Queen suspects that they may not have her best interests at heart. One of them is trying to sabotage her public appearances: that much she is sure of. When two bodies turn up in Chelsea, the Queen finds herself unwillingly used as the alibi for somebody very close to her. With the reputation of the monarchy at stake, Elizabeth knows she can't face these challenges alone.

It's 1961 and the Queen is planning her state visit to Italy aboard Britannia. But before she goes, an unreliable witness claims to have seen a brutal murder from the royal train. Did it really happen, and could the victim be a missing friend of Princess Margaret's new husband, Tony Armstrong Jones?