A first class murder

The indomitable Mrs. Eleanor Roosevelt is on her way back to the U.S. aboard the great liner Normandie, pride of the French Line. At a cocktail party the first night of the voyage, in the presence of Mrs. Roosevelt and many others, a Russian Ambassador collapses and dies, the victim of strychnine poisoning. Mrs. Roosevelt once again dons her sleuth cap to lead the reader to the tantalizing solution.