Dance with the Dead — Richard S. Prather

This case couldn't have been more up Shell Scott's alley. Twelve naked, luscious beauties, one for each month of the year, were Scott's next assignment. They were called the "Wow" pinup girls and, man, were they wow! Scott's mission: find four freckles. Four freckles located on one of these tomatoes' tushies. That was the only clue Scott had to help him solve this murder. But not to worry, it's the perfect mixture of business and pleasure for Shell Scott, P.I.