Based on the historical fantasy "All Souls" trilogy by Deborah Harkness, 2018's "A Discovery of Witches" follows Diana Bishop, a history professor at Yale University who shies away from her magical bloodline. When she accidentally summons a long-lost manuscript with important information on the supernatural, she and the manuscript become targets. Witches, demons, and vampires are all in decline, and the manuscript could hold the key to strengthening each respective species. Vampire Matthew Clairmont, a biochemist by profession, is an interested party, but his repeated attempts to get close to it reveal a growing connection with Diana as well.