Mortal Queens by Victoria McCombs is a compelling entry into the realm of young adult fantasy literature, blending elements of magic, intrigue, and personal growth into a well-woven tapestry that keeps the reader engaged from start to finish. This novel presents a fresh perspective on the dynamics of power and the burdens of leadership through the lives of its vividly drawn characters, set against a richly imagined fantastical backdrop.

The story centers around Princess Arabella, a determined and yet relatable protagonist, who is thrust into a whirlwind of political machinations and ancient prophesies as she prepares to ascend to the throne of her kingdom. McCombs excels in portraying Arabella’s inner conflict and evolution, making her both admirable and sympathetic. Her journey is not just about coming of age but also about understanding the complex layers of governance and diplomacy in a realm where magic plays a crucial role in sustaining power and ensuring peace.

One of the novel's strengths is its world-building. McCombs crafts a world that is intricate and believable, infused with a magical system that is both unique and well-defined. The cultural and political structures described in the book are detailed and add a layer of realism to the narrative. The setting, with its castles, hidden places, and shadowy corners, adds a gothic charm that enriches the atmosphere of the story.

The supporting characters are equally compelling and contribute significantly to the plot and protagonist’s development. From the steadfast and mysterious knight Sir Gideon to the enigmatic and dangerous Queen of the Night, each character is well fleshed out with motives and personalities that are distinct and memorable. Their interactions with Arabella not only push the plot forward but also present themes of loyalty, betrayal, and the gray areas in between, which are explored thoughtfully throughout the book.

However, Mortal Queens is not without its flaws. At times, the pacing seems uneven, with some parts of the book racing forward too quickly, while others seem to drag slightly. This may leave readers feeling slightly disoriented, particularly during key transitions in the narrative. Additionally, while the elaborately constructed world is generally a positive aspect of the book, some readers might find the amount of detail overwhelming, occasionally bogging down the flow of the story.

Thematically, the novel delves into issues that resonate with contemporary societal themes, despite its fantastical setting. It questions the meaning of power and explores the responsibilities that come with it, challenging the characters' morality and choices. McCombs doesn't shy away from the darker aspects of these themes, and the narrative is better for it, providing a gritty realism that contrasts with the more whimsical elements of the fantasy genre.

The narrative style of McCombs is rich with descriptive language and vivid imagery, which sometimes borders on the poetic. Her ability to craft such vivid imagery is particularly evident in her descriptions of magical phenomena and the lush, daunting landscapes that surround her characters. The dialogue is sharp and helps in fleshing out the characters’ personalities and the dynamics between them, although at times, the voices of the characters can seem slightly inconsistent.

In conclusion, Mortal Queens by Victoria McCombs is an ambitious and largely successful young adult fantasy novel that offers a compelling narrative, intricate world-building, and thoughtful exploration of complex themes. Arabella's journey is both enchanting and thought-provoking, making her a protagonist that readers will root for and remember. Despite some minor issues with pacing and narrative consistency, this novel is a promising start to what could become a beloved series for fans of the genre. It is recommended for readers who enjoy fantasy tales with strong, complex female leads and those who appreciate a deep dive into the mechanics of magical realms intertwined with human emotions and political intrigue.