New trailer for Sherlock season 4 shows you that dark secrets will be revealed.

A new trailer has dropped for the BBC's fourth season of Sherlock and things are about to get very serious. Sherlock (Benedict Cumberbatch) and Watson (Martin Freeman) face off against a new villain named Culverton Smith (Toby Jones) and it seems that he will hold nothing back.

"It's not a game anymore."



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Source: YouTube - Sherlock