Masterpiece Mystery!
Season 38, Episode 19 of 21 :  Foyle's War, Series V - Plan Of Attack

It's April 1944; Foyle has resigned as Detective Chief Superintendent of Hastings Police and his team is struggling to adjust to life without him. When his new replacement is suddenly and mysteriously killed, the station is at their wits' end. Will Foyle come out of retirement and once again track down the guilty perpetrators?