Twilight for adults....boo. 
 (view spoiler)[I had hopes this could feel like more academically grounded fantasy what with the alchemy, the history professor angle, and the "centuries old vampire." However, it all just boiled down to forbidden romance and a woman under the sway of a controlling, aloof, and superhumanly strong man (Twilight). While the portray of Diana attempts to present a willful and strong female character, she ultimately comes across needy and willing to abandon her entire career path and belief system in order to be with a man. She is a wild creature who requires training to understand and control her powers. She makes all her impulsive and passionate decisions based on being with a guy she just met. She also comes across flighty and without true convictions as she easily disregards her academic pursuits, plays spy in her lover's home, and generally displays no real personality of her own. 
 I'm intrigued by the trifecta of creatures (witches, vampires, and daemons) and how the evolution of these beings transpired. However, the romance aspect is too arduous to continue with the series. (hide spoiler)]