Download or read book The Sigma Protocol written by Robert Ludlum and published by Macmillan. This book was released on 2002-10-13 with total page 684 pages. Available in PDF, EPUB and Kindle. Book excerpt: After an old friend tries to kill an investment banker, he teams up with a field agent in Europe to solve the mystery of what really happened after World War II, and what the CIA code word of SIGMA represents.