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

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.

A much-needed update to the Royal Yacht draws scrutiny to the Queen's reign. Hounded by the press, Charles and Diana have a second honeymoon in Italy.

Prince Philip offers his support to a grieving family member. Keen to snatch a scoop, a tabloid journalist approaches Diana about a tell-all book.

As BBC's Martin Bashir goes to great lengths to secure an interview with Diana, the lonely princess finds purpose and warmth in a London hospital.

The Queen spends quality time with Prince William. On Guy Fawkes Night, fireworks make for a perfect distraction from Diana's BBC interview.

Eager to improve the monarchy's public image, the Queen seeks out savvy statesman Tony Blair — but the Prime Minister's advice defies royal protocol.

Reeling from loss and wary of her Golden Jubilee, the Queen bonds with William, who finds his footing between normality and life in the royal limelight.