The Drowner: A Novel - John D. MacDonald

One day after it was all over, after it was ended and done and there was no going back to change any part of it, Paul Stanial realized, checking the dates, that he and the Hanson woman had gone swimming on the same day, at the same hour, over a hundred miles apart, and had walked from the same noontime simmer of May in Florida, across sand into coolness. But on that day he had never heard of her, or even of the grove-country lake in which she had died that day.

Nevertheless, it had changed his life at a time it most desperately needed changing, and he found a strange significance in the fact that her swim in that silent lake had ended her life, and that his swim of that junk beach below Lauderdale had been part of the procedures that were sickening him, and had led him to demand the change which brought his life into tangent with hers, after hers was over.

 

Okay, I´m intrigued. Unfortunately I have to go to work for a couple of hours, but I will read more later tonight