On August 3, 1948, Time magazine editor Whittaker Chambers made a stunning allegation before the House Un-American Activities Committee: Alger Hiss, president of the Carnegie Endowment for International Peace and former high-ranking State Department official, had served with him in the Communist underground. Hiss's defense was the most gripping story of its day, and the question of his guilt has remained an American enigma.

Now, historian Allen Weinstein finally solves, once and for all, one of the great American mysteries. Weinstein also, for the first time ever, draws upon previously inaccessible information from Soviet archives. The result is an extraordinary book that leaves anyone who reads it with one inescapable conclusion: Alger Hiss was guilty.