Why did the eccentricities of the brilliant composer Antonio Vivaldi attract the attention of his contemporaries? Why is there so much written about it? Before his death, the red priest of Venice left a strange document with a terrible secret to a sect called Fraternitas Charitatis. What mystery did Vivaldi hide? A Spanish musician will try to find it three centuries later, but he will have to struggle with powerful organisations that also want that document, and they are prepared to kill in order to have it.
