A young Princess Elizabeth marries Prince Philip. As King George VI’s health worsens, Winston Churchill is elected prime minister for the second time.

With King George too ill to travel, Elizabeth and Philip embark on a four-continent Commonwealth tour. Party leaders attempt to undermine Churchill.

When dense smog cripples London for days and creates a serious health hazard, Churchill’s inaction leaves him vulnerable to his political enemies.

A letter from Peter Townsend spurs Margaret to make a bold proposal. Elizabeth has good news that causes complications for Margaret.

A salacious government scandal hits close to home for Elizabeth and Philip. Elizabeth retreats to Scotland for rest during a difficult pregnancy.