Defy the Night is the first book in a fantasy series by Brigid Kemmerer. We do not know if Defy the Night is going to be a duology, trilogy, or contain more books. However, we at least know that Defy the Night is going to have a sequel called Defend the Dawn.
You could say Defy the Night contains a love triangle. Yet it is not a love triangle as the 2 male characters are one and the same. Tessa is divided by her heart. She loves Wes but always hated the prince for his brutal acts.