Having seen the movie, and enjoyed it, I gave the book a go. Despite being written 40 years ago now, it still has the feel of a contemporary book. Because of the claustrophic setting of the building, in which a lot of the action takes place,the real world doesn't impinge much.
Ira Levin writes in a nice, easy to read style, which makes you want to read more and more every time you finish a chapter. I won't give much away about the plot, just to say that the year 1966, in which it is set, is very relevant, and the book will make you wonder if the mundane things around you are quite as mundane as they seem!!
Well written, great storyline, good characters (although I found Rosemary to be a little too dumb at times), and a book that will make you think a little. Worth picking up.