02:15McLevySeries 3Episode 4: 4. Servant of the CrownBBC Radio 4 Extra Duration: 45 minutes Fri 3rd Jul 2009, 02:15 on BBC Radio 7Available for yearsListen nowWith a royal visit due, the detective joins Her Majesty's protection squad to hunt down a deadly assassin. Starring Brian Cox.GenresDramaCrimeBrandMcLevySeriesMcLevy: Series 3 Source: BBC Online