Bölüm Adı: Fidelity (2) - Yayın Tarihi: 13 Mar. 2017
Konu (Dikkat Sporiler içerebilir!)
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.