George and Catherine Stewart share not only the burden of Catherine's heart disease, which could cause her death at any time, but the memory of Jerome Martell, her 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 the 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, Russia, and China before his return home.