Wormwood— G. P. Taylor

As 1756 London is engulfed in total darkness, Agetta Lamian, a young housemaid for scientist Dr. Sabian Blake, discovers that her employer has recently acquired the Nemorensis, a legendary book that holds the key to unlocking the secrets of the universe and that warns of a potential apocalypse as a comet called Wormwood threatens to collide with London.