This novel is the story of a radio astronomer who manages to detect a signal from space, and what happens after. The scope is large, but Sagan keeps it going smoothly forward to the incredible conclusion. The discussion of science versus religion is well done, and lacks the bitter antagonism which could easily have creeped in. Fills you with a sense of wonder like few other books, and while it makes you feel small in the Universe, it nevertheless manages to convey a message of hope and love.
I also loved the movie. It was faithful to the spirit of the book, but given the time constraints it did not delve into the interesting details of the book. Also, it glosses over the important and very engrossing religion vs. technology discussion.
One of my favorite novels.