It was written in one day, July 11, 1958, and first published in the March 1959 issue of Fantasy and Science Fiction magazine after being rejected by Playboy. The story involves a number of paradoxes caused by time travel. In 1980, it was nominated for the coveted Balrog Award for short fiction.
Although it is slow to watch, it keeps you interested in the plot line. It is not until three quarters into the movie until it all comes together and it leaves you puzzled long after the movie is over.
One has to admire the imagination of the writer to come up with the "find the beginning of a circle" scenario.