The Luna Trials by Marissa Gilbert (Complete)

After Savannah’s mate turned out to be a traitor who tried to kill her family, she decided she did not want to love or feel anything anymore. So, when the Lycan King of the Northern Kingdom comes to her brother to demand her hand in marriage in return for his support, she decides to make the ultimate sacrifice and accept the proposal.

However, when she arrives in the North, she has the shock of her life finding out that the King did not count on her agreeing to become his wife. Moreover, to avoid marrying her, he invited twelve other brides to compete for the title of The Luna of The North.