Kirsty Young celebrates the 70th wedding anniversary of the Queen and Prince Philip by examining the longest royal marriage in British history through key moments. She looks at how every step of their life together has been played out in the glare of publicity and in service of the nation, while steering it through decades of change.

Juliet Forrest is convinced that the reported death of her father in a mountain car crash was no accident. Her father was a prominent cheese scientist working on a secret recipe. To prove it was murder, she enlists the services of private eye Rigby Reardon. He finds a slip of paper containing a list of people who are “The Friends and Enemies of Carlotta.”

The likeable and carefree Grand Duke of Abacco is in dire straits. There is no money left to service the State’s debt; the main creditor is looking forward to expropriating the entire Duchy. The marriage with Olga, Grand Duchess of Russia, would solve everything, but a crucial letter of hers about the engagement has been stolen. Besides, a bunch of revolutionaries and a dubious businessman have other plans regarding the Grand Duke. With the intrusion of adventurer Philipp Collins into the Grand Duke’s affairs, a series of frantic chases, plots and counter-plots begins.

Tony Lip, a bouncer in 1962, is hired to drive pianist Don Shirley on a tour through the Deep South in the days when African Americans forced to find alternate accommodations and services due to segregation laws below the Mason-Dixon Line relied on a guide called The Negro Motorist Green Book.