The Line is one of the books the that isn't good, but not bad. It didn't have an amazing plot, and felt more thought up on the spot, than planned. I also thought that if there's an impenetrable barrier, nobody can hear through it, or see through it, or interact with people on the other side. This book was very "enh."
I really can't say anything too negative, or too good about this book. I really think that the characters could have been more developed, and that the whole idea of the government was sort of dumb. I don't recommend this book to anyone.