This season, Vanessa Ives and her allies find themselves locked in epic battle against an unholy evil that will arouse every forbidden instinct, unlock every secret and turn every sin of their past against them. But how do you fight the most wicked enemy, when the price of victory could be your own damnation?
As Victor struggles to resurrect Brona, Ethan prepares to leave London and Malcolm discovers that Vanessa is plagued by new visions.
Vanessa meets Caliban for the first time, while Victor begins to train the resurrected Brona in the rudiments of language. Meanwhile, the group turns to Ferdinand for help translating the Verbis Diablo.
Vanessa tells Ethan how she came to harness her abilities thanks to the help of an older witch... and the tragedy that followed.
While Ferdinand helps Malcolm decipher Brother Gregory's writings, Vanessa helps Victor pick a dress for his cousin. Meanwhile, Dorian takes Angelique on a date, and Ethan rescues a young woman from a runaway horse.
After sealing the townhouse against further intrusion, the group goes its separate ways for the moment. Rusk starts asking questions of Ethan, Brona and Victor draw closer, Vanessa teaches Caliban how to dance, and Evelyn launches her next steps in her campaign to seduce Malcolm.
Malcolm learns of his wife's death but isn't as upset as Ethan and Vanessa believe he should be. Meanwhile, Ethan asks Sembene for a favor, and Dorian sends out invitations for Angelique's coming-out ball.
Ethan and Vanessa make their way to the Cut-Wife's cottage to get a weapon against the Nightcomers. Meanwhile, Brona goes out with Dorian.
Malcolm fights off Evelyn's enchantment and goes to confront her. Meanwhile, Brona reveals her true colors to the Creature, and Angelique finds Dorian's portrait.
While Evelyn torments Malcolm, Victor summons Ethan and Vanessa back to London to rescue their friend. Meanwhile, Brona learns Dorian's secret, and Caliban is betrayed.
Vanessa has to use all of her strength to try and defeat the demon.