And that's just the first of many hidden references and shout-outs. WHAT WE SEE: This episode is entitled "His Last Vow."WHAT IT MEANS: The title references Sherlock's vow, made at the end of the previous episode, that he would do anything to protect John, Mary and their unborn child.

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WHAT IT MEANS: In Doyle's original story, Holmes compared Milverton to a snake and asked if Watson ever studied serpents in a zoo.

He added, "I've had to do with 50 murderers in my career, but the worst of them never gave me the repulsion which I have for this fellow."WHAT WE SEE: Sherlock tells John that Magnussen has a personal fortress called Appledore, which houses vaults of information he uses to blackmail others.

WHAT WE SEE: Sherlock compares Magnussen to a shark, asking if John has ever studied a shark in an aquarium.

He mentions that while he has dealt with murderers, psychopaths, terrorists and serial killers, none turn his stomach like this blackmailer.

It all felt a little too soon to bring back the arch nemesis.

Magnussen was only just getting started before he was disappointingly taken out.The Internet was set alight with speculation following the “death” and reappearance of Sherlock at the end of back in 2012.It was a masterful stroke of genius by writers Steven Moffat and Mark Gatiss and left viewers wanting more.However, to attempt to replicate this interest by resurrecting Moriarty comes across as desperate.Moriarty should have remained in Sherlock’s mind palace for at least another series before he came back.WHAT WE SEE: In Sherlock's apartment, he easily gets the better of his brother Mycroft and forces him against the wall.