With Holmes gravely injured and time running out, Watson embarks on a dangerous undercover mission. The plan is to finally bring Gruner to justice, but a woman with nothing left to lose soon turns the investigation on its head. 

A Noiser podcast production.

Narrated by Hugh Bonneville 

Written by Sir Arthur Conan Doyle

Produced by Katrina Hughes

Script Supervisor: Addison Nugent

Sound Design and Audio Editing by: Mirianna Pitman Latham

Sound Supervisor: Tom Pink

Compositions: Dorry Macaulay and Oliver Baines

Mix & Mastering: Josh Latham

Series Consultant: Dan Smith

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