06:45R Austin Freeman - Thorndyke, Forensic InvestigatorSeries 1Episode 2: The Puzzle LockBBC Radio 4 Extra Duration: 15 minutes Wed 23rd Nov 2011, 06:45 on BBC Radio 4 ExtraThe detective tackles a mysterious problem, a strong-room lock with a fatally difficult combination. Read by Jim Norton.GenresDramaCrimeBrandR Austin Freeman - Thorndyke, Forensic InvestigatorSeriesR Austin Freeman - Thorndyke, Forensic Investigator: Series 1 Source: BBC Online