The Gates of the Souls — Roger LeLoup

Yoko and her friends – both Earthlings and Vineans – are back among the stars, cruising near the mysterious Ultima and its atemporal mists. Long ago, refugees fleeing their home world Vinea were lost in them. Their souls are said to still haunt this now sacred place, and an ancient law prohibits Vineans from entering. But when a probe coming from Ultima zooms past her ship, Yoko doesn’t hesitate to disregard the interdiction – after all, she’s not Vinean, is she?!