The invention of a limited use time travel device allows some of the pressure to be taken off Galactic Milieu society, as misfits, rogues, adventurers and criminals have somewhere to go, other than the safe, structured worlds of the Milieu.
We follow the eight person strong Group Green as this journey back in time and are soon shocked to discover that the past is ruled by a alien race, the Tanu, who all have metaspychic abilities, and are fighting an ages old enemy. They recruit and use humans for labor and for breeding which they are having considerable problems with due to genetic radiation damage.
Each of the eight people deal with this differently, and eventually come into their personality roles. Operant humans are not supposed to go through the time gate, but not all of Group Green are metapsychially powerless.
Another surprise is that the Tanu have technology that activates latent metapsychic abilities, and use this as a carrot to get some of the humans to work with them.
5 out of 5