Relentless Queen by Genevieve Ami Moon is a gripping tale set against the turbulent backdrop of a fantastical kingdom where power struggles, ancient magic, and unyielding ambitions intertwine in the life of its protagonist, Ivana Seratos. Moon crafts a narrative that is not only rich in its world-building but also in its exploration of complex characters driven by their deeper, often darker desires.

The novel opens with the young princess Ivana witnessing the brutal overthrow of her parents, which sets her on a relentless path for power and retribution. The author's choice to begin the story with such a poignant event sets the tone for a narrative that is consistently intense and emotionally charged. As Ivana grows from a scared child into a formidable player in the kingdom's politics, Moon adeptly portrays her transformation through trials that test her intellect, willpower, and moral boundaries.

One of Relentless Queen's most compelling aspects is Moon's skillful world-building. The Kingdom of Eldoria is not just a setting, but a living, breathing entity that plays a crucial role in the story. From the misty Greenvale forests to the opulent halls of Castle Crevasse, Moon paints each location with vivid detail that transports readers directly into the heart of the story. Furthermore, the social and political systems are deeply intertwined with elements of magic that Moon explores through ancient lore and the characters' interaction with mystical forces that help and hinder them on their journeys.

Moon does not shy away from the darker elements of her tale. Indeed, Ivana’s ascent is marked by not just her triumphs but also her manipulations and moral compromises. The plot is woven with intrigue, betrayal, and a nuanced look at what it means to be a ruler in a male-dominated world. Ivana's own relentless quest for power is portrayed in shades of gray, allowing readers to empathize with her while questioning her methods and motives. This complex characterization is one of the novel's strengths, presenting Ivana not merely as a titular queen, but a dynamic character capable of both great cruelty and deep affection.

The supporting cast of characters are equally well-developed. From the stalwart knight, Sir Rohan, who serves as both Ivana's conscience and spear, to the cunning witch, Merala, whose own secrets are as twisted as the spells she casts, each adds depth and intrigue to the narrative. The dynamics between Ivana and these characters enrich the story, creating layers of tension and alliance that propel the plot forward effectively.

The thematic elements in Relentless Queen are thought-provoking, delving into questions of power, legitimacy, and the sacrifices that leadership often demands. Ivana's rule is contested at every turn, not just by her enemies but also by those who question the legitimacy of her methods. Moon uses these conflicts to explore broader themes pertinent to our own world, such as the role of women in power and the often-blurred line between justice and vengeance. These themes are handled with care, avoiding clichéd resolutions and instead offering more introspective, sometimes ambiguous, conclusions.

The narrative pace is brisk, with twists and turns that keep the pages turning. However, it’s the emotional depth that truly grips the reader. Ivana’s internal struggles, coupled with her external conflicts, make for a profound narrative drive that marries well with the exploration of her character. Moon's prose is beautifully crafted, with a lyrical quality that matches the mythical elements of the tale while maintaining clarity and sharpness in the unfolding drama.

While the plot and character development are generally well-executed, some might find the middle segments a bit slower compared to the thrilling opening and the climactic finale. Despite this, the slower pace does allow for deeper character interactions and setting descriptions that add richness to the world Moon has created.

In conclusion, Relentless Queen by Genevieve Ami Moon is a captivating fantasy that successfully combines strong characterization, intricate plotting, and immersive world-building. It offers not only an enthralling story but also poignant reflections on power, ambition, and humanity. For fans of complex fantasy sagas featuring powerful female leads, Relentless Queen promises and delivers a compelling read filled with emotional and narrative depth. Genevieve Ami Moon has woven a tale that beckons readers to question what they know about power and redemption, making it a memorable addition to the genre.