York, John R "The Five Watches - an accident of time"

Time is running out for humanity. After 700 years of research, Dr. Wilhelm Gussen finds humans on the brink of extinction. But an accident of time may provide an unexpected opportunity to save the future when neighbors from the 21st century are unexpectedly thrust into a deadly 27th century conflict.

It is 600 years in the future, 2619. Man has all but destroyed planet Earth. The New World Order is using genetic engineering to control every aspect of human existence, including procreation! Suddenly, a scientist, his pheromone enhanced mate, and son find themselves thrust back to 2019. A small group of unlikely characters band together to save the future people from themselves. Will they stop the tribe that is attempting to acquire a cache of arms to carry back to the future, or will civilization continue to spiral down the path to destruction?