Hopkins himself was about to head back to England after finding no long lasting success in the states before landing this role. It's what kept him here and would later allow him to become a true horror supervillain. Ann-Margret, who was always eager to break out of the "female Elvis" mold but was never able to during her teen idol days, delivers the goods as the unhappily married woman of Corky's dreams. And Burgess Meredith, who a year before had experienced great renewed stardom after an Academy Award-nominated performance in "Rocky," is fantastic as Corky's shrewd agent who suspects that there's more to Fats than meets the eye. Watch this whether you're a horror fan or not.
Hopkins is outstanding and gave an award worthy performance. Oscar worthy but it was a strong year so he wouldn't have won. Margret was likeable, Ed Lauter played one of his few scummy roles well, and Meredith was Meredith as badass as ever. Great score by Jerry Goldsmith and Attenbrough did a great job dirrecting.
I'd highly recomind this if you love either character stories, creepy films, or tragedies. Not a horror film but it delivers the goods.