Isn't the premise of the movie (who the killer is), patently ABSURD?!!!
SPOILERS
You know, that sir William Gull was the killer.
I don't mind the conspiracy plot, nor the reasons, but the bit of the Queen having her 70 year old physician play hitman.
I mean, come on, a 70 year old man?!!!
Like the Queen couldn't have her men of trust hire a professional hitman (soldier, cop, investigator, you name it) who BTW were also physically fit for the job!!!
May as well have the Queen herself commit the crimes, heh?
And to top it all off, since Gull is enforcing the Queen's wishes, why on Earth is he punished for it? Because he went overboard? Well hello, that's what you get for asking murder and mayhem from someone who is not in such line of work!!! Anyone would go insane in the process unless he's not already harnessed by such trade (ask any white collar dude to fill in for a slaughterhouse worker ONE DAY and let me know how that goes).