Containing over 30 minutes of exclusive video content, games, and an entire mystery for you and Sherlock to solve, the iOS App is released on Monday 20 January in the UK, and Monday 27 January in the USA.

Sherlock Holmes has a message for you. He wants you to help him solve his latest case. Using your mobile phone, you must navigate the streets of London discovering clues, solving puzzles and piecing together the case.

Watch the trailer…

Series 3 concluded earlier this month with ‘The Sign of Three’.

> Buy Series 3 on DVD on Amazon.

> Buy the Series 1-2 boxset on Amazon.

What do you think of the app? Let us know below…