Her name is Blaise and she's irresistible to boys. Her dark, smouldering beauty is an invitation to jealousy and madness. And now she's ready to kill. Eric Ross is the perfect catch, a star athlete who wants to be a vet. "Hands off," warns her cousin Thea, who is determined to protect this particular human boy from the girl who was born to destroy men.
Blaise's black magic is powerful. The only way Thea can fight back is to use her own white magic, to bewitch Eric herself as a bluff. But soon Thea finds herself getting too close to Eric, feeling forbidden emotions, breaking Night World laws. Falling in love. As Halloween and the Night of the Witch draws close, can Thea save Eric -- and herself -- from Blaise's vengeance?
Thea and Blaise Harman are witch cousins and are as close as sisters. There's only one slight difference: Thea uses white magic and Blaise uses black magic. Blaise uses her charm and magic to make boys do anything for her, including cutting themselves with razors and burning down schools.
When the cousins start attending a new school and Thea heals Eric Ross from a snake bite, Thea and Eric realize they are soulmates. Blaise is jealous that Eric has chosen Thea and is worried that Thea is breaking Night World law to be with Eric.
In a desperate attempt to protect Eric from Blaise, Thea accidentally releases an angry spirit that kills one of Blaise's admirers. Thea and Eric try their best to capture the angry spirit by luring it away from the school.
But Thea is wanted by the Circle because she is not allowed to use that kind of magic, as are Blaise and Thea's friend Dani. Thea manages to tell them that Eric is in trouble because the angry spirit is with him. She manages to get to Eric before he is killed and puts the spirit back where it came from.
The Circle tells her that she cannot love a human so she chooses to drink the Cup of Lethe, a drink that erases a part of your memory, to erase her and Eric's knowledge of the Night World.
However, Blaise had switched the drink with iced tea, so neither forgets that the Night World exists.