Sotheby's, London, 1936. A paper by Sir Isaac Newton is sold at auction to a bookseller's agent and within minutes of leaving the auction house, he is killed and the paper stolen. For the Nazis are desperate to get their hands on a Newton formula that will unleash the Secret Fire - a weapon beyond all imagining that can wipe their enemies off the face of the earth. And this document is the key . . . unless the French Resistance and SOE operatives...