A Court of Frost and Starlight is the fourth book in the series A Court of Thorns and Roses. The series follows Feyre Archeron, a 19-year-old human woman, as she is forced into the world of faeries and High Fae after killing a fae in wolf form while hunting. In the first novel, Tamlin, the High Lord of the Spring Court, brings her back to his court as payment for killing the wolf fae. Tamlin and Feyre fall in love, but when Tamlin sends her home for her safety, she learns of a prophecy foretelling that she would save Tamlin and his entire territory from a curse by Amarantha, a woman who rules a court “Under the Mountain.” By allowing Tamlin to send her away, Feyre triggered Amarantha taking Tamlin under the mountain in anticipation of the curse. Feyre makes a deal to complete three trials to save Tamlin and the Spring Court. She successfully completes them with the help of Rhysand (or Rhys), the High Lord of the Night Court, whom many believe to be Amarantha’s willing servant and lover. When Amarantha kills Feyre in retaliation for Feyre succeeding, the high lords of all the courts, who were also enslaved in some manner by Amarantha, provide their powers to bring Feyre back to life as a High Fae woman.