Sherlock HolmesThe Return of Sherlock Holmes - Series 2Episode 6: The Second StainBBC Radio 7 Duration: 45 minutesFirst broadcast: Wed 8th Oct 2008, 10:15 on BBC Radio 7Latest broadcast: Fri 2nd Dec 2011, 01:00 on BBC Radio 4 ExtraThe Prime Minister asks the sleuth to recover a letter vital to national security. Stars Clive Merrison and Michael Williams.GenresDramaCrimeBrandSherlock HolmesSeriesSherlock Holmes: The Return of Sherlock Holmes - Series 2 Source: BBC Online