Here’s a trailer for a very particular episode of the series Sherlock. Broadcast on BBC One channel on the 25th December, this “Christmas Special” episode will focus on an “impossible” case led by Sherlock (Benedict Cumberbatch) and his acolyte Watson (Martin Freeman), in a Victorian London. Immersed in old ghosts stories, the two heroes followed by Mary and Lestrade will be thrown in the past. A case signed Conan Doyle that will make us wait until the season 4 expected in 2017.