12. John does websearch on Sherlock.
13. We meet Mrs Hudson; Sherlock’s housekeeper. He helped her husband become executed.
14. Mrs Hudson assumes John and Sherlock are a couple.
15. John admits to Sherlock he’s looked him up. Sherlock analyses John some more.
16. Sherlock is approached by Lestrade as there has been a fifth murder.
17. John is left with Mrs Hudson as Sherlock bounds out the door to investigate.
18. Sherlock knows he can use John to his advantage as he has a medical military background.
19. John accompanies Sherlock at the investigation.