A submarine strikes a seamount just off North Korean waters and Mac must ask the Chinese for help. Meanwhile, Dickie's constant need for information has begun to irritate everyone. Meanwhile the first family deals with the question of reelection.

While trying to coordinate the rescue of the crew of a damaged U.S. submarine off the coast of North Korea with help from Chinese, Mac must deal with war fever among her advisors and a leak from China to the North Korean government that threatens to start a nuclear war. Meanwhile, Speaker Templeton’s wife secretly encourages Jayne Murray to accept Nathan’s offer to rejoin his office as chief of Staff.