Jack and the team are mystified when the TV presenter of a holiday programme is found drowned. The spotlight falls on the crew.

A mysterious cipher is being scrawled on the walls around London. The first person to see the cipher is dead within hours of reading it. Sherlock plunges into a world…

A mysterious cipher is being scrawled on the walls around London. The first person to see the cipher is dead within hours of reading it. Sherlock plunges into a world…