BBC One/Masterpiece has released a new teaser for "Sherlock" season 4. While it doesn't include any actual footage from the new installment, the brief video titled "Rising Tide" does stress how serious the situation is now, AceShowbiz said.

In the clip, Sherlock (Benedict Cumberbatch) and Dr. John Watson (Martin Freeman) look pensive as they are sitting in the former's 221B Baker Street apartment. Water floods the flat up to their ankles and Sherlock's belongings are floating. "It's Not A Game Anymore," so reads a caption of the video.

The fourth season of the Emmy-winning drama will once again be comprised of three episodes which promise "laughter, tears, shocks, surprises and extraordinary cases." According to the press release, in the upcoming season John and Mary "prepare for their biggest ever challenge - becoming parents for the first time."

The first episode titled "The Six Thatchers" will air January 1, 2017 on PBS Masterpiece, the same date it airs across the pond. Toby Jones is added to the cast as new villain Culverton Smith, Mark Gatiss reprises his role as Sherlock's brother Mycroft Holmes, Amanda Abbington returns as Mary Morstan and Una Stubbs reprises her role as Mrs. Hudson.