Down The River Road by Gregory Benford
Approx. 21,060 words.
Published on August 15, 2012.
One man's search for his father through the chaos of shifting time, in the far future, when science has advanced well beyond the limits of time until mystery and danger rule a man's life—and time shifts in chaotic swirls. A backwoods fantasy in a riverland derived from mysterious science indistinguishable from magic, by a master of SF time exploration.