Dr Seth Shostack is the senior astronomer at SETI in California, and having spent his life searching, scientifically, for 'little green guys' as he likes to call them, he knows his stuff. He's optimistic about SETI's search, despite it's lack of success so far, and this book retells the history of the institute and it's future prospects and hopes. It's very well written, and Seth's enthusiasm and love of science and astronomy runs throughout. It's also pretty non technical, meaning amateur science nerds will be able to enjoy the big picture without getting too bogged down with the actual astrophysics and quantum theory behind it all.
I listened to this book in audio form, and while the reader did a good job I was disappointed it wasn't Seth himself behind the mic. Seth has a regular radio show/podcast and is fantastic to listen to, so it's a real shame he didn't read his own book.
I would also recommend reading another book on SETI which came out at much the same time as Seth's. It's called
The Eerie Silence: Are We Alone in the Universe? and is by another top SETI scientist - Paul Davies. The contrast between Seth's outlook and Paul's is stark, as Davies takes a far more pessimistic view on our chances of making contact. Both are very interesting however and to my eyes, equally valid viewpoints. I just hope that Seth's view turns out to be right in the end.