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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