Elizabeth grows concerned as Labour Party leader Harold Wilson becomes prime minister amid anti-monarchy sentiment and rumors of his possible KGB ties.
With Britain in need of a financial bailout from the U.S., Elizabeth reluctantly enlists Margaret to assist in winning over President Johnson.
Following a tragic accident at a Welsh mining village that quickly becomes political, both Elizabeth and Wilson struggle with their responses.
As the royal family makes a documentary to boost their image, an unexpected guest arrives from Greece, throwing a wrench into Philip’s publicity plans.
Pursuing improvements in her racehorse management, Elizabeth imagines the life she might have had. Meanwhile, a plot against her government is brewing.
Amid rising Welsh nationalism in the run-up to his investiture as Prince of Wales, Charles is sent to spend a semester there and learn the language.
As the first men land on the moon, middle-aged Philip feels dissatisfied by his lack of achievement and begins searching for inspiration.
As Charles begins dating Camilla Shand, Elizabeth considers visiting an ill Duke of Windsor in Paris, whose destiny changed when he met Wallis Simpson.
While a government stalemate with mineworkers leads to nationwide power cuts, Charles's family intervenes in his deepening relationship with Camilla.
As her marriage disintegrates, Margaret seeks comfort elsewhere. But her fragile state of mind and lack of family support make true happiness elusive.