And don't let Poirot investigate the murders, get Inspector Foyle (plus his young driver miss Honeysuckle Weeks) on the case.
Not just murders of course but blackmarketeering, fiddling petrol rations, illicit stills making whisky, accidents at the chemical warfare test facility, deserters, and IRA bomb plots.
http://www.foyleswar.com/Did you ever see the SFSFW scenario for invasion of a small island ? The island in question was Sodor, so there were lots of railway problems.....