Sherlock Season 4 Trailer Promises Some Dark, Secret Love

Sherlock Season 4 is just around the corner now, with the series finally coming back on New Year's Day.

To get you excited, here is a new trailer showing off the trials Sherlock is most certainly going to be going through this season. Gone is his cool and calm persona, with the character looking quite disturbed at the happenings around him.

Also, I know who I think he is saying 'I love you' too, but there are a lot of possibilities. It is a really great tease as to the question of the season.

Take a look: