Detective Naomi Charlton is investigating a mass brawl at a nightclub when she becomes aware that a man is breaking into the homes of females. He doesn't damage or take anything, but l something invisible is left behind and he leaves the building exactly as he found it, so the occupants have no idea he was ever there.

Naomi realises that it is a crime and goes to her superiors, who dismiss it as low priority, particularly as no one has made a complaint.

Only when the wife of the town's MP is affeced does she get taken seriously and is given full resources.

Inspired by real events.