Is Moses Herzog – philosopher, suffering romantic and cuckhold – losing his mind? His formidable wife Madeleine has left him for his best friend and he is left alone with his whirling thoughts, yet he still sees himself as a survivor, raging against private disasters and those of the modern age. His head buzzing with ideas, he writes frantic, unsent letters to friends and enemies, colleagues and famous people, the living and the dead, revealing the spectacular workings of his labyrinthine mind and the innermost secrets of his troubled heart.