Beloved Enemy by Hywela Lyn
Cat Kincaid is obsessed with killing the man she believes is responsible for the torture and death of her sister, but when she eventually catches up with him, survival becomes a greater priority than revenge.
Kerry Marchant, haunted by memories, regret, and self-blame, shields himself from the pain of the past by committing himself totally to the starship, Destiny, of which he is part owner. However, the beautiful, red-haired woman who reminds him of his lost love, and who he suspects is working for a corrupt regime, represents a possible threat not only to the ship, but to his heart.
Marooned on an inhospitable planet, they need to work together to stay alive, fighting not only unknown assailants, but their growing attraction. But how can they learn to trust each other when he has vowed never to get close to a woman again, and she made a solemn pledge to destroy him?