Novel gives sense of being watched

Why would anyone want to spy on Jeremy O'Keefe? After all, he tells the reader, "I am no one," just a history professor who recently returned to America after a decade teaching in England. But Jeremy can't shake the feeling that he's being watched.

First, his computer is hacked. Then he spots a man in a ski mask standing on the sidewalk below his apartment, staring at his window. Next, he receives a series of parcels filled with paper records of every website he has visited, every email he has sent, every phone call he has made.

Jeremy doesn't know if the parcels are a threat or a warning; but someone, it seems, has taken an unnatural interest in him. Or, maybe, family members suggest, he's suffering from a paranoid delusion.