Season 4

As Elizabeth welcomes Britain's first woman prime minister and Charles meets a young Diana Spencer, an IRA attack brings tragedy to the royal family.

Margaret Thatcher visits Balmoral but has trouble fitting in with the royal family, while Charles finds himself torn between his heart and family duty.

After Charles proposes, Diana moves into Buckingham Palace and finds her life filled with princess training, loneliness — and Camilla Parker Bowles.

While Margaret Thatcher struggles with the disappearance of her favorite child, Elizabeth reexamines her relationships with her four children.

As Thatcher's policies create rising unemployment, a desperate man breaks into the palace, where he finds Elizabeth's bedroom and awakens her for a talk.

On a tour of Australia, Diana struggles to balance motherhood with her royal duties while both she and Charles cope with their marriage difficulties.

Grappling with mental health issues, Margaret seeks help and discovers an appalling secret about estranged relatives of the royal family.

As many nations condemn apartheid in South Africa, tension mounts between Thatcher and Elizabeth over their clashing opinions on applying sanctions.

Charles is caught in a deadly avalanche, prompting both him and Diana to reevaluate their commitment to their troubled marriage.

Amid a growing challenge to her power, Thatcher fights for her position. Charles grows more determined to separate from Diana as their marriage unravels.