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The Calling was first published on October 29, 2001.
Morgan has a dream about a ritual sacrifice. The International Council of Witches thinks that it is a vision of the future. They suspect that the it is a vision of an illegal sacrifice by a Woodbane coven, Amyranth, to obtain power. It is suspected that the sacrifice may in fact be a child of Ciaran MacEwan, one of Amyranth's members. The council sends Hunter to New York City, the place where the coven is suspected to operate, to investigate. Morgan goes with Hunter, however she also wished to discover more about her birth parents, who she knows lived for a brief time in Hell's Kitchen.
At the invitation of Bree, they stay at the apartment of Bree's father. Robbie, Sky and Raven come along for the ride. At a New York disco they meet Killian, who turns out to be Ciaran's son. It is then believed that Killian is the target of the Amyranth sacrifice. Ciaran meets Morgan in the same disco and he decides to sacrifice her. He sets a trap for her, but when he finds out Morgan is his daughter he helps Hunter to stop the ritual before it's too late. During the time that the ritual is taking place, Morgan realizes that Hunter is her mùirn beatha dàn, or soulmate.
In the end of the book, Morgan breaks up with Hunter because she finds out that she is Ciaran's daughter, one of the most evil witches of the age, and also her mother's mùirn beatha dàn and murderer. Morgan believes that she is like poison and being around Hunter is going to get him killed.