The London Underground has ghosts. Well, the London Underground always has ghosts, but usually they're gentle, sad creatures. Lately there's been an outbreak of more aggressive ghosts. Groping, shoving, insults that are racist and/or misogynistic--offensive and provocative. Victims of the assault report them, but have completely forgotten them by the time Transport Police get back to them to follow up.
Jaget, the member of the Transport Police most adept at seeing ghosts, calls in Peter Grant, Patrol Constable and Apprentice Wizard, part of the only unit of the Metropolitan Police that deals with ghosts and other spooky stuff. He in turn brings along Abigail, who, yes, is only a teenager, but as someone, perhaps Nightingale, says, she sees ghosts when she's on her own. Just as well to have her supervised and learning how a proper investigation is run.
