Morton Farrier was no longer at the top of his game. His forensic genealogy career was faltering and he was refusing to accept any new cases, preferring instead to concentrate on locating his own elusive biological father. Yet, when a particular case presents itself, that of finding the family of a woman abandoned in the midst of the Battle of Britain, Morton is compelled to help her to unravel her past. Using all of his genealogical skills, he soon discovers that the case is connected to The Spyglass File—a secretive document which throws up links which threaten to disturb the wrongdoings of others, who would rather its contents, as well as their actions, remain hidden forever. This is the fourth book in the Morton Farrier genealogical crime mystery series, although it can be enjoyed as a stand-alone story.