Have You Watched This Film

Sometime ago, I watched this movie titled BESTY (not sure of the spelling now). It is based a bestseller novel, I can not remember the Author. Since then I have being asking people around about the film, but no one seem to know anything about it.

The story (i will try to recollect as much as I can)  is based on race car manufacturing, love and sex. It started by showing a girl swimming and someone (a visitor to their home) looking at her nude body as she swims.
The story goes on and on.

Have u watched this film before, if yes, what is Title and Author of the bestseller .

The Betsy is the movie title i guess
http://www.imdb.com/title/tt0077228/

The Betsy is also the book title. Harold Robbins is the author
http://www.amazon.com/gp/product/0671874837/104-5938640-3695960?v=glance&n=283155

never read or watched it.

havent watch ir yet