Vivian is the Emperor’s favored consort, but her life is a waking nightmare of secrets. Her two twin princes are not entirely human; at night, they transform into black panther cubs. Navigating the treacherous harem where one slip means death, Vivian must hide her sons’ beastly nature from a suspicious Emperor Julian. When the secret is violently exposed at a state banquet, Vivian must choose between the man she loves and the 'monsters' she brought into the world.