As we wait the new episode of Sherlock this Sunday on BBC1, an extended trailer for 2×02 The Hounds of Baskerville has been released!

It premieres Sunday, January 8th at 8:30 PM GMT. Below is a synopsis and the trailer!

Something terrible has happened to Henry Knight; Sherlock and John investigate the truth about the monstrous creature which apparently killed their client’s father. A hound from hell? What seems like fantasy in Baker Street is a very different prospect in the ultra-secret army base that looms over Dartmoor.