Peacekeeper novels (Tanya Huff)

Warden Torin Kerr has put her military career behind her and built a life away from the war and everything that meant. From the good, from the bad. From the heroics, from the betrayal. She's created a place and purpose for others like her, a way to use their training for the good of the Confederation. She has friends, family, purpose. Then Torin's past suddenly comes back to haunt her. Big Yellow, the ship form of the plastic aliens responsible for...