Islands of Tomorrow by F. M. Busby

In Time….
Luke Tabor’s principles have landed him in prison–and Derion, a self-proclaimed “man-of-will,” has the power to set him free. But Luke has no idea how far out of time his enigmatic friend intends to lead him…
There is a trapped interim in time’s normal current–where generic disaster has spawned dangerous overbreeding. These are the Far Islands. And it is here the battle will be joined for humanity’s future…and past.