02/03/2014 03:45 pm ET Updated Feb 04, 2014

'Sherlock' Season Finale: Holmes Kills A Man In Cold Blood

Wrapping its latest quick season, "Sherlock" ended with a moment we never expected to see. With no other legal recourse available to him in order to protect John and Mary, Sherlock shot Magnussen in cold blood. "I’m not a hero. I’m a high-functioning sociopath," he said as an explanation for his choice.

Mary's secret past as a covert operative was uncovered in this installment, and her attempts at having a new life separate from that were endangered by Magnussen, who used information to blackmail people of all kinds. He was a shark preying on everyone, and so Sherlock put him down with no remorse.

For his trouble, he was exiled from England -- for about four minutes. It was supposed to be longer, but the episode ended with a startling return. Despite shooting himself last season, it would appear that Moriarty has returned. At the very least, his image took over every screen in England. And so, Sherlock Holmes and John Watson are needed again, though we've no idea when they'll pick up the case.

"Sherlock" will be back for a fourth season, but there is no indication when it might happen. Thus far, the show has been running one-and-a-half to two years between seasons.

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