With that, the boyish, grinning Yuri Gagarin launched into space on April 12, 1961, becoming the first human being to exit Earth's orbit. The twenty-seven-year-old lieutenant colonel departed for the stars from within the shadowy world of the Soviet military-industrial complex. Barbed wires, no-entry placards, armed guards, false identities, mendacious maps, and a myriad of secret signs had hidden Gagarin from prying outsiders-not even his friends...