The series takes place in a world similar to our own but one where vampires, witches, werewolves and shape-shifters live among humans without their knowledge. These supernatural races make up a secret society known as the Night World, which enforces two fundamental laws to prevent discovery: 1) Never allow humans to gain knowledge of the Night World's existence and, 2) Never fall in love with one of them.
Keller is a black panther. She will do whatever it takes to survive. Keller meets her match when she’s hired to protect Iliana Harman, a blond ditz whose only concerns are clothes, boys, and parties. Can Iliana be the legendary Witch Child, one who can fend off the end of the world? Galen, the gorgeous boy destined to be the Witch Child’s soulmate, and Keller are falling in love, but it’s a love that will destroy everything. Keller knows she has to give him up — but her heart won’t listen.
Meanwhile, the Night World is closing in, to kill all three of them.