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.

Kate puts her best foot forward after pillow talk with Hal forces her to face hard truths, and Vice President Penn offers a blunt lesson in geopolitics.