It draws on extensive interviews with Kissinger, as well as 150 other sources, including Richard Nixon and Gerald Ford. In addition, it makes use of many of Kissinger's private papers. The result is an intimate narrative, filled with surprising revelations, that takes this century's most colorful statesman from his childhood as a persecuted Jew in Nazi Germany, through his tortured relationship with Richard Nixon, to his twilight years as a globe-trotting business consultant.