Freedom's Landing by Anne McCaffrey (Catteni, #1)

Used; Hardcover - very good; 1st edition; dust jacket has some tearing around the spine. 

Kristin Bjornsen lived a normal life, right up until the day the Catteni ships floated into view above Denver. Now, as human slaves are herded into the maw of amassive vessel, Kristin realizes that her normal life is over, and her fight for freedom is just beginning.