Diana and Matthew travel to a witch’s house in Madison to find a spell to access the manuscript. Diana’s Aunt Sarah and fellow witch Agatha help train her. The Congregation intensifies its hunt.
The couple flees to a secluded Sept-Tours (Matthew’s family château). Diana performs a dangerous spell to temporarily bind her powers. Matthew confronts his dark past. Peter Knox, a powerful Congregation witch, closes in.
Matthew follows Diana to convince her to help him find the manuscript again. Diana’s latent powers resurface. They begin a dangerous alliance, and the Congregation (supernatural governing body) takes notice of their forbidden interaction.
Satu kidnaps Diana and tortures her to force her magic out. Matthew rescues her with violent repercussions. Diana begins to accept her powers. The couple learns the manuscript’s secrets may involve creatures’ origins and a prophecy.
Matthew takes Diana to his ancestral home in France to protect her. Their bond deepens romantically. Diana struggles with controlling her magic. The Congregation dispatches a powerful witch, Satu, to retrieve Diana.
Matthew and Diana visit his vampire “son,” Marcus, in London. Diana’s magic evolves with seven distinct strands. A daemon friend, Hamish, helps them decode the manuscript’s clues. The Congregation orders their arrest.