When John Millington Synge and Molly Allgood fell in love, he was thirty-five, she nineteen. Neither knew that he had Hodgkin's disease, of which he was to die in three years. Synge had already achieved recognition as a playwright--translations of two of his plays had been performed in Berlin and Prague--and he was codirector, with Yeats and Lady Gregory, of the Irish National Theatre Society. Allgood had started her acting career the year before,...