Mrs. Watson wrote:

How does Janine arrive to work every day? Does she uses Magnussen's private lift or there is another lift she uses? Anyway she must have a card that gives her access or someone else must have one (a security person that lets her in). Cards can be stolen or cloned and I'm sure Mary found a way to do just that to get in. I don't think Janine gave her access.

I should perhaps explain that I live in the City and worked here for many years; it is riddled with paranoia which makes it cutting edge security territory. All cards and all keys will have an elaborate tracking system which enables them to be traced at all times; no-one, but no-one, can obtain copies or clones because the companies whose job it is to produce those cards and keys will only do so for a request signed by the top security officer who will have already have launched an investigation into how one went missing.

I cannot even obtain duplicates of my own personal keys to my home from anyone other than the one company that makes them, and I need to have a very good reason indeed to order them. I am expected to have made a police report about the missing/mislaid/stolen keys.

I appreciate that what seems normal to me may seem strange to people who are not familiar with the City, but that is the way the City works; it's why anyone living here falls about laughing at the idea that a card could be stolen and/or cloned.

And thus, having eliminated the impossible we are left with one option; Janine let her in.
 

Swanpride wrote:

Sherlock has one month of preperation...Mary worked way longer on this, long enough that Janine was her chief bridesmaid. Who knows what kind of information she extracted from Janine during that time. Plus, Sherlock said that she "left through whatever way she came"...and she didn't encounter John on her way out.
Also, Sherlock is mostly about going undercover and getting information, he is not a trained thief, or bomb expert or anything else in this direction.

Sherlock was unconscious when Mary left; I'm pretty sure that not even Sherlock could manage to observe what someone was doing whilst he was dead to the world, and very close to being dead altogether.

It's difficult to see how being a trained thief or a bomb expert would have assisted Mary in scaling a skyscraper in the City of London; Sherlock was going undercover to get information via Janine, which is precisely what you say his skills are. And it still makes no sense for Mary to pursue a friendship with Janine if Mary really wanted out; all that did was expose her to more risk. Admittedly, it made no sense for Mary to have anything to do with John Watson either; that exposed her to the risk of publicity as well, which is inadvisable for anyone trying to escape from their previous career.

The simplest explanation is that Mary was lying about her reasons for shooting Sherlock; the only things we can be sure of is that she did shoot him, and she tried to track him through London with a loaded gun in her pocket, thus requiring the deterrent of her picture projected against the 'Empty House' to make sure the police would spot something amiss if his body was found there.

If we are going to speculate then perhaps Sherlock may have been egocentric in assuming that she called the ambulance for him; it's possible that it was for Janine...




 

Swanpride wrote:

Mary might have entered through different means...she is a trained agent, after all. And Janine might not have even seen her.

 
She is a trained agent, but so is Sherlock, who has just spent 2 years at the sharp end;  if Sherlock couldn't get through the security at Tower 42 without Janine then Mary couldn't either.

I do not believe that the writers would Mary Sue her character to the point where she has superhuman ninja skills enabling her to scale a skyscraper in the most heavily policed part of London without anyone noticing.

And if Mary is genuinely trying to hide from people aware of her past, why would she maintain a friendship with the PA to a man notorious for his interest in acquiring information to exert power wherever he can? Even if Mary met Janine casually I would expect her to drop her at the speed of light as soon as she realised who her employer was...

Swanpride wrote:

Well, it is not like John is totally okay with the situation. He said himself that he is still angry, will most likely stay angry and that this anger might boil to the surface from time to time - but he wants to be with her. And she is ready to accept this, if he just gives her this chance.

 
I am not sure that John is being entirely truthful in the conversation he has with her before she passes out due to the laced tea; John may not have dumped the original memory stick in the fire, and he may not have Sherlock's blind spot when it comes to motherhood.

Sherlock grew up accepting that his mother had abandoned her career as a mathematician in order to have children; she sacrificed something she was absolutely passionate about for the sake of her children. His reaction to Mary's pregnancy is, I think, greatly influenced by that fact; John may be rather more sceptical. Indeed, John may now be driven by the need to ensure that Mary does not simply disappear, taking his child with her; what other way is there to ensure that it does not happen?