I'm not done the book yet, but those repeated instances of Harry feeling like he's being watched from above... I'm assuming that's a federal spy drone?
If so, what about a piece of technology is triggering his supernatural spidey senses? I can buy vague perceptions of the airspace over the island thanks to his connection with its intellectus, but back in the city, even after the EMP, there has to be plenty of other technology brought back in from outside as part of the aid effort.