Satan's Affair by H.D. Carlton plunges readers into a darkly seductive narrative that intertwines elements of romance, mystery, and supernatural intrigue. Set against a backdrop of foreboding landscapes and shadowy figures, Carlton crafts a story that not only tantalizes the senses but also probes the complexities of love, loyalty, and redemption.

The novel introduces us to Vivian, a young woman whose life takes an unexpected turn when she encounters Damien Black, a charismatic yet enigmatic figure with a chilling secret. Damien, the titular character associated with 'Satan' not just through name but through his intricate dealings in the underground world, epitomizes the classic anti-hero. He is both dangerous and alluring, a combination that proves irresistible to Vivian. As their relationship deepens, Vivian is drawn into a labyrinthine plot that challenges her perceptions of good and evil.

Carlton's writing style is elegantly descriptive, with a meticulous attention to detail that vividly paints the setting and atmosphere of the novel. Whether describing the haunting beauty of a decrepit estate or the electric tension of a forbidden romance, the prose is lush and immersive. This vivid description is one of the book’s strengths, allowing it to straddle the line between reality and the supernatural with believable ease.

The narrative is adeptly paced, weaving suspense and romance in a way that keeps the reader hooked from the first page to the last. The author utilises a dual perspective, alternating between Vivian and Damien's point of view. This technique effectively deepens the emotional resonance of the plot and allows for a nuanced exploration of the characters’ inner conflicts. Vivian, portrayed as both resilient and naïve, steers through the unfolding mysteries with a commendable blend of courage and vulnerability. On the other hand, Damien's chapters offer a glimpse into his tormented soul, showcasing Carlton’s ability to humanize a character that could easily be written off as a mere villain.

One of the central themes of Satan's Affair is the exploration of power dynamics within relationships. Through Vivian and Damien's interactions, Carlton delves into how power can both corrupt and redeem, a theme that resonates deeply within the intricacies of their romantic entanglements. As Vivian becomes more entangled in Damien's world, she begins to question not only her autonomy but also her ethical boundaries, setting up a compelling psychological and emotional conflict.

Moreover, the supernatural elements are skillfully woven into the plot, adding layers of complexity without overshadowing the novel’s real essence—the human experience. These elements serve more as a catalyst for character development rather than the main focus, which makes the story accessible to even those who might not typically gravitate towards supernatural genres.

While the book excels at character development and atmospheric tension, some readers might find the relationship dynamics troubling. The boundary between passion and control blurs frequently in Vivian and Damien’s romance, sometimes venturing into realms that could unsettle or alienate. Consequently, this aspect of the plot demands a thoughtful reader, one who is prepared to navigate the murky waters of a relationship that challenges conventional moral boundaries.

Additionally, the resolution of the plot threads might feel rushed for some. As the climax builds, there is a frenetic rush to tie loose ends, which can leave the conclusion feeling slightly underwhelming after the robust build-up of suspense throughout the book. However, this does not significantly detract from the overall enjoyment and the thematic impact of the narrative.

In conclusion, Satan's Affair by H.D. Carlton is a provocative and mesmerizing novel that offers a rich tapestry of themes and emotions. It blends the eerie charm of gothic elements with the intense emotionality of a tumultuous romance, resulting in a compelling read that lingers in the mind long after the last page is turned. For readers seeking a story that combines depth with darkness, and love intertwined with legacies, this book promises a potent mix that is hard to resist.