A Discovery of Witches is a TV adaptation of the All Souls Trilogy by Deborah Harkness.
It follows the story of Diana Bishop, an alchemical history professor at The University of Oxford who, after accidentally calling an elusive, long-thought-lost manuscript, is compelled to embrace the magic in her blood she has sought to keep out of her life and engage in a forbidden romance with charming vampire Matthew Clairmont.
By day, the Duncan's are an upstanding family who run a thriving exotic car dealership in New York. By night, they live a dangerous secret life. When they come under siege the Duncan's will have to stick together or die separately.