At its core, 'Immortal Dark' is a story about the enduring bonds of family and the sacrifices we make for those we love. Kidan's fierce determination to find her missing sister, June, drives her every action, even as it leads her down a perilous path. The lengths to which Kidan is willing to go for her sister highlights the powerful, unbreakable connection they share. Throughout the novel, the theme of family extends beyond blood ties, exploring the intricate dynamics within the vampire Houses and the loyalties that bind them.

Kidan's journey is also one of self-discovery as she navigates a world where her human existence intersects with a hidden, powerful vampire society. Torn between her human upbringing and the allure of the vampire world, Kidan grapples with her own identity and where she truly belongs. The stark contrast between the human and vampire worlds, with their respective cultures and power structures, forces Kidan to confront her own prejudices and preconceived notions.

Immortal Dark delves into the intoxicating allure of power and its potential for corruption. The vampire society, with its intricate hierarchy and ancient bloodlines, presents a breeding ground for ambition and intrigue. Kidan soon discovers that the line between good and evil is blurred within the vampire world. As she uncovers the truth about her sister's disappearance, she encounters individuals driven by their own desires for power, regardless of the cost.