There had been reports suggesting that there was a ghost on the Metropolitan Line. Which Jaget brought to me, because disruptive phantasmagoria is the responsibility of the Special Assessment Unit, otherwise known as the Folly, otherwise known as “those weird bleeders.” Since, despite being an Operational Command Unit, the SAU consisted of me and Detective Chief Inspector Nightingale, and since Inspectors don’t get out of bed for anything less than a body in the vicarage, most initial case assessments were done by yours truly.