If you knew Susie

Henry Ivan Valentine, once a suave society gynaecologist, now an old man, is eking out his last few months high up on scaffolding surrounding the ruins of Corfe Castle. He is - to his knowledge - the last man alive. He hopes there may be others. He is writing his story down as an explanation to those who might come after him, and as a means of giving some purpose to his own existence.
He structures the story round his relationship with Susie, his first and last wife. He tells it more or less chronologically beginning in a cyclone on board ship in the 60 s and ending sometime in the not too distant future. His past regularly intermingles with his present condition, both of which develop throughout the story and converge to a climax in the final chapter.