After a hostile attack on a British vessel, seasoned diplomat Kate Wyler assumes a new role in the UK that puts her skills — and marriage — to the test.

As new details about the bombing emerge, Kate struggles to see eye-to-eye with Hal. Prime Minister Trowbridge's fiery remarks at a funeral cause a stir.

To appease Trowbridge, Kate seeks Hal's help with a high-profile visitor and consults an informed source in secret as complicated feelings begin to grow.

In London, Hal's actions cause friction as Kate heads to Paris with Dennison to get a handle on the Lenkov situation, which soon takes a shocking turn.

After rushing back to London, Kate shares her suspicions about the bombing. The search is on for Lenkov — and Roylin. Eidra delivers devastating news.

Eidra helps sneak an unannounced guest into Grove's funeral, Kate realizes she might have made a bad call before the bombing, and Stuart speaks his mind.

A lavish Fourth of July party gives Kate a chance to help Dennison, who sees an opportunity after the prime minister's announcement about Lenkov.

Kate proposes a unique solution to the Roylin problem. A risky plan unfolds at the prime minister's event in Scotland. Stuart confronts his feelings.

Vice President Grace Penn arrives in London with an agenda — and advice — as fallout from Roylin's bombshell affects Kate's relationship with Trowbridge.