Andrew Martin is the author of the Jim Stringer series, detective novels set during Edwardian times that began with The Necropolis Railway in 2002. The seventh and latest instalment is The Somme Stations, in which Stringer leaves his home in York for the front lines of the Somme, as part of the North-Eastern Railway Battalion, aka The Railway Pals. But the men under his charge turn out to be far from pals