It’s time to get Sherlocked again! The hit British TV show announced that Sherlock will ring in the New Year with a season four premiere on January 1, 2017. The show also issued a new trailer for the upcoming season.

Moriarty may be back to terrorize the great detective once again. The ominous trailer promises that “everything they know will be tested” with plenty of dark and gloomy shots of what Sherlock and John will face. And Toby Jones makes a very unsettling appearance.

The first episode is called “The Six Thachers” and the second is “The Lying Detective.” Sherlock airs on BBC One in the U.K. and PBS in the U.S.