Angels in the gloom

In March of 1916, Protestant chaplain Joseph Reavley is wounded. With his shrapnel-peppered broken arm and a shattered leg, he is sent back to Cambridge for surgery and a hospital stay. During his recuperation period at the Reavley family home in Cambridgeshire, he is thrust into investigating a murder case that places national security in peril. Meanwhile, the Germans are advancing along the Somme - and England is losing many ships to German U-boats...