Marlie Hall

Joan and Kitty try to prove that a string of murders, stemming from an old case Sherlock and Kitty solved in London, is connected to an international government conspiracy with the Defense Intelligence Agency at its center. Also, Sherlock and Kitty's relationship is strained after she shares life-changing news.

Elizabeth and President Dalton work together to solve the Greek debt crisis, but not everyone at home is happy with the agreement. Meanwhile, Henry mulls over a new job offer, and Stevie reconnects with her childhood friend, the President's son.

Elizabeth's landmark global climate treaty with more than 200 countries is jeopardized when China threatens to back out due to her meeting with an ailing Dalai Lama. Also, Henry worries about his undercover operative's safety, and Jay is surprised when Abby serves him with a custody agreement for their daughter.

Elizabeth must fend off a baseless investigation into her past that threatens to derail legislation. (TV-PG D, L)