The Final Problem

"The Final Problem" is the third episode of the fourth series of the British television series Sherlock and the thirteenth episode overall. The episode was first broadcast on BBC One, PBS, Channel One and 1+1 on 15 January 2017. Plot A young girl wakes up on an aeroplane and finds everybody asleep. Panic stricken, she picks up a mobile phone and attempts to call for help only to hear the voice of Jim Moriarty announce, "Welcome to the final problem". After staging a break-in at his home and tricking him into revealing Eurus existence, Mycroft Holmes reveals that, like himself and Sherlock, Eurus was also born with advanced intellectual abilities, even being described as an era-defining genius on a par with Isaac Newton. However, she also has a total lack of normal sensation and emotion.