The Grey King, authored by Susan Cooper, features a compelling central image of a "cold white flame" located at the heart of the Light. This flame symbolizes purity, hope, and the profound struggle against darkness. The narrative weaves a rich tapestry of themes such as good versus evil, the importance of heritage, and the quest for identity through the journey of its characters.

Throughout the story, characters confront various challenges that test their bravery and loyalty. The "cold white flame" serves as a guiding light, representing the enduring spirit of resistance and the power of friendship in overcoming adversity. The novel explores the balance between light and darkness, urging readers to recognize the potential for change and growth in their own lives.