Danny Robins takes a deep dive into all the cases so far this series, with new leads, new witnesses and listeners' questions and theories.

Written and presented by Danny Robins Editing and sound design: Charlie Brandon-King Music: Evelyn Sykes Theme music by Lanterns on the Lake Commissioning executive: Paula McDonnell Commissioning editor: Rhian Roberts Produced by Danny Robins and Simon Barnard

A Bafflegab and Uncanny Media production for BBC Radio 4