A night with an alpha

She was a princess loved by all and the mate of an Alpha whom she loves dearly. However, on her wedding day, her pack got destroyed and she was captured by the dreaded alpha who no one has seen his face. The last word her dying groom told her was: "Avenge my death!" Would she be able to keep that promise? He had limited days to live and in those moments, he wishes to find who the moon goddess had assigned to break the curse! But who could love a beast and a man who could only be seen at night?