Secret of My Millionaire Sister(1971)

Choo died in South America and left a legacy of US Dollars two million to the younger daughter, Pei Fun, of his old friend Chang in Hongkong. The second beneficiary in the will, should Pei Fun die, was Nana, the young widow. Nana returned to Hongkong and conspired with her lover Johnny to wrest the fortune from the Chang family...