It’s been about two years since Sherlock Holmes died and there’s someone that isn’t convinced he’s actually dead.
It’s only 7 minutes long. Inspector Lestrade talks to Anderson who is convinced Sherlock is alive and has been keeping track of incidents that sound like they may involve him. Then he goes to see Watson, giving him an unedited birthday video he made Sherlock record.
It’s interesting enough I guess but it’s not like it adds anything to the show. It’s pretty much just an intro or something. I say watch it just because of Watson being pathetic without Sherlock and Sherlock being a complete asshole.