Sherlock faces perhaps the most chilling enemy of his long career: the powerful and seemingly unassailable Culverton Smith – a man with a very dark secret indeed.

Sherlock faces perhaps the most chilling enemy of his long career: the powerful and seemingly unassailable Culverton Smith – a man with a very dark secret indeed.

Adam catches a glimpse of the wonders of travelling in the Tardis, as they head to a future, where Satellite 5 broadcasts to the entire Earth Empire. But anyone promoted…