Wait, has anybody ever considered the possibility that Mary was working for CAS?
He needed a lever on Sherlock; so why not blackmail an ex-assassin he has dirt on and get her to make John fall in love with her?
She could, of course, then actually have fallen in love with John and decided to flip on the whole deal. It’d also explain why she looked so disturbed when she found out she was pregnant.
from Tumblr http://ift.tt/1FA8QJ8