The Alpha King's omega mate

Katherine's life has known no peace and happiness. Her father's brother killed her parents and overtook her pack as the Alpha. As if that was not enough, his Luna and two daughters made life unbearable for her. She was meant to be the Alpha's daughter and the rightful heir to the throne but everything was shattered and now, her life has been reduced to an omega. The Alpha king has come to take his mate in their pack. But he also wants something else. What could it be? And how will Katherine fight to get back to the top and take back everything that originally belongs to her?