: It is revealed that Eurus had been hiding in plain sight, impersonating Smith's daughter (Faith), John’s bus flirtation, and even John’s new therapist.
: Struggling with severe PTSD and grief, John experiences vivid hallucinations of Mary, using her as an internal dialogue to process his anger and loss. Watch Sherlock s04e02 hdtv x264-brisk[eztv]-1
: The episode ends on a stark note as Eurus reveals her identity to John and seemingly fires a gun at him, setting the stage for the series finale. Critical Themes : It is revealed that Eurus had been