Sherlock and John are spending Halloween in the States. But it's not just a vacation. They are lying low, trying to buy some time and get away from Moriarty until they have a game plan. Meanwhile, they are put on a mysterious case in New York, where, leading up to the days before Halloween, people are being viciously murdered. Can they solve the crime before All Hallow's Eve comes to an end? Or will this be a case they can't solve in time?
*Takes place after Series 3*
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