The Catteni series (also called the Freedom series) is a tetralogy of science fiction novels by American writer Anne McCaffrey. In this universe, humans are slaves of aliens, the humanoid Catteni. Woven through all four of the books are details of the relationship between Kristin Bjornsen, a former slave, and Zainal, a renegade Catteni.
The Catteni series consists of the following books: Freedom's Landing (1995),[1][2][3]Freedom's Choice (1996),[4][5][6] Freedom's Challenge (1998),[7][8] and Freedom's Ransom (2002).[9][10][11]