Critic Consensus: Sherlock makes a welcome and shocking return, and Cumberbatch and Freeman are game, but it may prove difficult to live up to the lofty expectations created by the series' lengthy hiatus.
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Not many shows can handle such swift and complete shifts in tone as this, but Sherlock makes them look positively elementary.
So. Sherlock season four started off with a bang, didn't it?
It's kind of a mess. And it really only justifies the impending narrative for the rest of season four - in which John will push Sherlock away as Sherlock awkwardly tries to help him recover - if you ultimately think their relationship is worth salvaging.
Sherlock's fourth season kicks off with a bang in a thrilling, if imperfect, episode that sets up the show's newfound darker tone.
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