The Pursuit of Happiness by Douglas Kennedy

Manhattan, Thanksgiving Eve, 1945. The war was over, and Eric Smythe's party was in full swing. All his clever Greenwich Village friends were there. So too was his sister Sara -- an independent, canny young woman, starting to make her way in the big city. And then in walked a gatecrasher, Jack Malone -- a U. S. Army journalist just back from a defeated Germany, and a man whose world-view did not tally with that of Eric and his friends. Set amidst the dynamic optimism of postwar New York and the subsequent nightmare of the McCarthy witch-hunts, The Pursuit of Happiness is a great tragic love story; a tale of divided loyalties, decisive moral choices, and the random workings of destiny.