21:15Sherlock HolmesHis Last BowEpisode 4: The Bruce Partington PlansBBC Radio 4 Extra Duration: 45 minutes Fri 14th May 2010, 21:15 on BBC Radio 7With national security at stake, the sleuth's brother Mycroft heads to Baker Street. Stars Clive Merrison and Michael Williams.GenresDramaCrimeBrandSherlock HolmesSeriesSherlock Holmes: His Last Bow Source: BBC Online