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.

Armed with a wooden stake, martial arts, and the will to resist a vampire's mind control, Rachel struggles to avenge her mother's death in The Chosen. Then she meets Quinn, her soulmate, who is part of the world she has vowed to destroy.