Freedom's Challenge by Anne McCaffrey

Abandoned on the planet Botany by their Catteni masters, a group of humans and other enslaved races now seeks to reclaim their worlds for themselves. This third installment of a series that includes Freedom's Landing  and Freedom's Choice  chronicles the stages of the war for liberation, from the theft of Catteni ships to the liberation of cargoes of slave laborers to a bold strike at the heart of the oppressor. McCaffrey excels as a storyteller and as a creator of worlds. Despite an occasional lapse in suspense, her latest novel provides a satisfying culmination to a saga of desperate courage and the desire for freedom. Most libraries should add this to their sf collections.