Ice Crown

A closed planet is visited by a Survey team, which consists of a young lady, her handsome and totally loathsome cousin and their uncle. The reason the planet was closed was before they were overthrown, the empire rulers were experimenters on a large scale with humans. They would brain-wipe them and implant false memories of their own choosing, then place them on planets to follow the lifestyles selected for them. Such was the world the young lady and the other team members found and she was drawn to breaking regulations to save a princess, thus making her a target for he uncle and cousin's revenge. She is lucky the evil ones were overturned...but their mind controlling machines still functioned.