Britain's royal family finds itself deeply affected by the turbulent times of the late 1950s and early 1960s as young Queen Elizabeth confronts a daunting series of events, from the Suez Canal crisis to the scandalous Profumo affair.

The Crown traces the life of Queen Elizabeth II from her wedding in 1947 through to the early part of the twenty-first century. Season Three covers the time period between 1964 and 1977 beginning with Harold Wilson's election as the Queen's first Labour prime minister and ending with the Silver Jubilee of Elizabeth II. It follows pivotal moments such as the death and state funeral of Winston Churchill, the Aberfan disaster, the Apollo 11 moon landing, and the Investiture of Prince Charles as the Prince of Wales.

As the 1970s are drawing to a close, Queen Elizabeth and her family find themselves preoccupied with safeguarding the line of succession by securing an appropriate bride for Prince Charles, who is still unmarried at 30. As the nation begins to feel the impact of divisive policies introduced by Britain's first female Prime Minister, Margaret Thatcher, tensions arise between her and the Queen which only grow worse as Thatcher leads the country into the Falklands War. While Charles' romance with a young Lady Diana Spencer provides a much-needed fairytale to unite the British people, behind closed doors, the Royal Family is becoming increasingly divided.