'I saw a chauffeur hit a girl and knock her unconscious. Then he threw her into a limousine and sped away ... ' Alice Whelan finds horror on Falcon Island: home of her retired movie star mother, Diana Hamilton, and her sixth husband, Leland Braddock. Who is the mysterious girl locked away in the mansion's tower? What is the truth behind the elaborate greenhouse that Leland and his brother maintain in the nearby woods? And what strange experiments are the two conducting with their Fatal Flowers?