George and Catherine Stewart share the worry of Catherine's illness, which could cause her death at any time, and the memory of Jerome Martell, Catherine's first husband and George's closest friend. Martel, a brilliant doctor passionately concerned with social justice, is presumed to have died in a Nazi prison camp. His sudden return to Montreal precipitates the central crisis of this novel. Hugh MacLennan takes the reader into the lives of his three characters and back into the world of Montreal in the thirties, when politics could send an idealist across the world to Spain, France, Auschwitz, Russian, China, and back, finally, to his old home.