View Iframe URL. It takes place over the course of a single day, but is just as jam-packed with Easter eggs and references to the work of Sir Arthur Conan Doyle -- especially his Sherlock story "The Sign of Four. Watson Jr. He and Watson never met, however. In Doyle's original stories, Mycroft was noted for being overweight and alarmingly lazy when it came to physical activity.
The meaning behind the name will be revealed in the next episode, "His Last Vow," but it also calls back to the episode "A Scandal in Belgravia," when Mycroft mentioned that Sherlock initially wanted to be a pirate. The phrase first originated in World War 2. It was used when a non-military person, who was armed gun or knife entered a British military base. The phrase was a signal for everyone duck out of the line of fire.
Sherlock knew that John, being a military man, would recognise this phrase and duck out of the way of the gun in the safe. But just before he opens it Sherlock mutters something to warn them. Just before he opens the safe, Sherlock looks at Irene probably because he suspects there might be some kind of booby trap.
She looks sharply down and to the right. It's obvious given what happens next that this look is code for "Duck!
So he knows to duck, and she knows to duck, but someone has to warn John somehow. You can see from John's reaction and expression immediately after Sherlock yells, "Vatican cameos!
Googling reveals that there seems to be some sort of myth going round that this is a phrase used by military personnel to indicate that there was an armed non-military person who had entered the base. I say myth because, despite it being repeated an awful lot on Tumblr, Yahoo! Answers and Urban Dictionary, I've yet to find a single corroborating source for it.
It's also nicely debunked here. The single place we do know of the phrase being used prior to Sherlock is in the original Sherlock Holmes stories. So, it's a nice little nod to the original stories, as we know the writers of Sherlock are keen on doing. This is definitely a codeword very precisely targetted at John.
Most likely, it's a reference to a case that Sherlock and John worked on together. The fact that it isn't explained in any more detail than "saying 'Vatican cameos' makes John duck" isn't particularly unusual for the series. Finally, this is brought up again in The Sign of Three , with slightly more explanation as to its meaning if not its origin.
Sherlock: Vatican Cameos. Mary: What did he say? What's that mean? John: Battle stations. Someone's gonna die. It's not clear whether it literally means "battle stations" or whether that's John's translation for this context much as his translation for the previous context was "the safe is trapped, get down". However, it's slightly more information than in Scandal.
Conan Doyle makes a reference about in "The Hound of the Baskervilles". I was exceedingly preoccupied by that little affair of the Vatican cameos, and in my anxiety to oblige the Pope I lost touch with several interesting English cases.
Vatican Cameos is a codeword used between Sherlock Holmes and Dr.
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