Things get creepy for historian and closet witch, Diana Bishop, when she calls up a magical manuscript. Her discovery is about to throw her back into the world of magic and into the path of Matthew Clairmont, a centuries old vampire.
There is another dark turn in store for Diana when an alarming package is slipped under her door. Meanwhile, her relationship with Matthew moves forward, but something is about to happen that will cast them both further into danger.
Diana gets a chilly welcome when she seeks safety at the Clairmont family home. Back in Oxford, trouble is brewing. Juliette shows up and throws Marcus' life into danger, while Satu pays the price for her curiosity.
Tensions between the creatures grow as the witches find out the vampires are studying DNA. Matthew crosses a line when he returns to Oxford. Diana discovers his dark past, before something unexpected tears them apart.