Dr. Petrie's expertise is called upon when a deadly plague begins to ravage the French Riveria. Accompanying him on his trip is his friend, the botanist Alan Sterling. As Petrie and Sir Dennis Nayland Smith struggle to contain the horror, Sterling cannot stop thinking of the mysterious Fleurette, unaware that the beautiful girl he chanced upon was raised by the emperor of evil himself, Dr. Fu Manchu.
Sax Rohmer was the acclaimed author of the Fu Manchu series of novels. The first, The Mystery of Fu Manchu, was published in 1912 with many more following. Rohmer also wrote more traditional detective stories and supernatural horror. He died in London in 1959.