Back in London after escaping from her father's island and the secrets she left behind, Juliet Moreau strives to stop a killer while searching for a serum to cure her own worsening illness.

Dr. Moreau's daughter, Juliet, travels to her estranged father's island, only to encounter murder, medical horrors, and a love triangle.

Deciding to illustrate a disturbing, secret handwritten manuscript from her late Pulitzer Prize-winning father, aspiring artist Haven Marbury is plunged into a nightmarish world when a monstrous creature appears, forcing her to uncover dark, otherworldly family secrets to rewrite everything she thought she knew about herself.

When their mistress is murdered, Anouk and her fellow beasties have only three days until their enchantment ends and they are transformed back into animals, but in seeking to remain human, they threaten the hierarchy imposed by the society of magic handlers in Paris called the Haute.