Sometime in the 30th Century, an experimental test spacecraft from 500 years in the past, with its pilot alive, shows up near the space station Trust Territory of Threshold. The officials must determine what to do with this antique relic ship and it's ananchonistic pilot. Meanwhile, a scavenger ship has brought back from the depths of space, a mysterious sphere like nothing anyone has ever seen before. Amidst these events, the station is full of religious adherents making thier yearly pilgrimage toward their holy land on Earth. Among them is a wayward daughter trying to escape the restrictive life within her society, and the controlling nature of her father. Also, a conference is being held to determine the rights of alien races and bioengineered species that have been created as endentured servents that flares political and spiritual debates that threaten to set off riots within Threshold.
An Excellent book with a fast pace, and characters you really get to know and are able to relate to their situations. I really enjoyed how the story dealt with the issues regarding liberty, freedom of choice, and the rights inherent to all persons, races and genders, whether from earth or some other planet, or even some other time. It shows that no matter how far into the future, or how far away from Earth we progress, there will always be ethical issues that transcend time and space.