Thorgal: Kriss of Valnor (Thorgal #20)

Aaricia and her children, sold as slaves to an Imperial prince, refuse to believe that Thorgal is dead, and keep trying to escape, eventually wearing off their new owner's patience. Condemned to a year of hard labor in the silver mines, they meet someone unexpected there: Kriss of Valnor, wielding the whip of a forewoman, yet a prisoner like them. Despite their mutual hatred, the two women will have to work together to escape.