What is the story of the Amityville Horror?

I don't want to see the movie; spoilers are welcome. Please add detail about when and to whom it happened. How was it discovered? Did anyone survive? How were the killings done? Was the murderer caught? Does the house still stand? Is it haunted? What are the details of its haunting? Would you recommend that I buy the book? Your answer SHOULD NOT be that I should see the movie.