13 Things You Need To Know About The New “Sherlock” Episodes, According To The Cast Themselves

Benedict Cumberbatch, Martin Freeman, Amanda Abbington, Mark Gatiss, and Steven Moffat discuss the fourth series.

Sherlock: The Six Thatchers is on BBC One on 1 January 2017 in the UK. It is on PBS Masterpiece in the United States (check local listings).