This is probably not the most sophisticated or deeply plotted Stephen King book - it is one of his early works and that shows. Pet Sematary is, however, the most absorbing and haunting novel I have ever read and is full of a black humour that remains with you long afterwards.
The concept is simplicity itself - happy all-American family move to their dream house in rural Maine and make friends with the kindly old couple across the street. This, of course, is the world of Stephen King - so everyone has a secret and nothing is quite as it seems. The one thing you can be sure of is that nobody is likely to live happily ever after...
The book is certainly bleak and not to be recommended if you're feeling depressed ! But, however intense the emotions that it evokes, the joy of meeting some of King's most believable and sympathetic characters and the experience of discovering just what is out there in the woods behind the Creed house are certainly worth it.
I have read this book countless times, but have never forgotton the pleasure of discovering it initially, when every plot development was new. If you are about to read Pet Sematary for the first time I envy you - enjoy !