The brother of fire - Christian Jacq

Thamos, Count of Thebes, one of the last members of a spiritual brotherhood keeping alive the secrets of the pharaohs, has been assigned the mission to find and protect the 'Great Magician', a genius whose works will save humanity.
Believing that he has found the One in popular young musician, Wolfgang Amadeus Mozart, he succeeds in initiating him in the Masonic rites inspired by the Egyptian Great Mysteries. Now Mozart has thrown himself into the rituals, in which he finds inspiration for two new operas - Figaro and Don Giovanni.
In love and the father of a young son, Mozart's career is advancing nicely, the commissions keep flowing in and famous singers knock on his door . . . until new menaces cast a shadow over his future. Menace from the powers-that-be, who fear the influence of the Masonic Lodges and put them under police surveillance; Menace too from jealous musicians - such as Salieri, who makes an attempt to sabotage Mozart's concerts.
Mozart resists and fights back, but will he manage to survive when the greater threat of war with the Ottoman Empire draws near?