Sherlock - Season 0 Episode 4 : Many Happy Returns 2017

Anderson believes that Sherlock is still alive after the Reichenbach fall. He confides in Lestrade and tells him his theory for his existence. Anderson believes a string of events ranging from Tibet to India to Germany involve Sherlock's assistance, and this is due to Sherlock not being able to stop investigating. Lestrade tells him Sherlock is definitely dead and goes to visit John, who has moved out of Baker Street following his death. He gives him some of Sherlock's old items, including a video message from John's birthday. In the message Sherlock states that he will see John very soon and tells him to have a good birthday without him as he is 'busy'.