A very nice concept, i.e. people able to hear anything said about them by anyone anywhere, but with no off switch, as a strange result of the Transcendalist Movement of the early 19th century, but the idea was less than engagingly explored. The characters might have become real had they been given more of an opportunity to interact, rather everyone is just a blip on the edge of Lindsay, a former child star, who spends the book obsessing about herself and her troubles and thoughts. Also, the origin of her and the other Hearer's ability was unsatisfactorily explained.
In sum, the story itself could not retain my interest which had been sparked by the plot as presented on the jacket.