 Why are the police studying Frownes so intently?
In the ensuing contretemps they emptied his rear pants pockets, got his wristwatch and restored the contents of the handkerchief pocket. It was this rather than skill that enabled the police to maintain such a tight surveillance on him, a surveillance that went to the extent of getting his fingerprints off the postman's bag, and which photographed, X-rayed and chemically analyzed the contents of his pockets before returning them. By the time Fownes reached his front door an entire dossier complete with photographs had been prepared and was being read by two men in an orange patrol car parked down the street. It expressed his weariness and distaste for people who went off and got neurotic when they could be enjoying a happy, normal existence.
 They are suspicious of the odd behavior occurring within and around his home
 They are threatened by his knowledge of and curiosity about the ancients  They are suspicious of the odd behavior occurring within and around his home  They believe he is responsible for the increased frequency of falling glass  They believe he is an informant to enemy forces outside of the Dome