In 1940, almost a year after the outbreak of World War II, Allied radio
operators at an interception station in South London began picking up
messages in a strange new code. Using science, math, innovation, and
improvisation, Bletchley Park code breakers worked furiously to invent a
machine to decipher what turned out to be the secrets of Nazi high
command. It was called Colossus. What these code breakers didn't realize
was that they had fashioned the world's first true computer. When the
war ended, this incredible invention was dismantled and hidden away for
almost 50 years. Paul Gannon has pieced together the tremendous story of
what is now recognized as the greatest secret of Bletchley Park.