Sherlock Season 4: 18 Easter Eggs & References From 'The Lying Detective'
1. John Watson Gets Shot
Shock horror! The Lying Detective ends with Eurus apparently shooting John. Literally no one out there believes this will be fatal for the good doctor, though, as trailers and images clearly show him alive and well in the season finale.
Assuming that John does get shot in some sort of capacity, this could be a reference to The Adventure of the Three Garridebs. In that story, Watson gets shot during the investigation and Sherlock rushes to his aid, clearly becoming emotional by his friend being in danger. Watson is touched by the moment as it is the only time that in the original stories that Holmes outwardly shows affection for his best bud.