Holmes and Watson race to Berkshire with Scotland Yard hoping to uncover the secret of the mysterious hydraulic press. A dangerous conspiracy is revealed, a country house burns, and the true purpose of Colonel Lysander Stark's midnight engineering work comes to light - but will justice catch up with the criminals before they slip away?

Narrated by Hugh Bonneville 

Produced by Katrina Hughes and Addison Nugent 

Sound Design and Audio Editing by Miri Latham, Anisha Deva and George Tapp

Compositions: Dorry Macaulay and Oliver Baines 

Mix & Mastering: Liam Cameron 

Series Consultant: Dan Smith 

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