A Discovery of Witches by Deborah Harkness is definitely targeted more at adults, but ACOSF readers will appreciate its sweeping mythology and angsty romance. Diana, a scholar and a descendant of witches, is shocked when a mysterious alchemical manuscript presents itself to her in her university library. The manuscript's appearance also draws Matthew, a geneticist and vampire, to her side. As the pair dig deeper into the text's origins and meanings, more supernatural beings close in on them, pushing them closer and closer together.