Seanan McGuire's When Sorrows Come is a captivating addition to the October Daye series, blending urban fantasy with a touch of romance and political intrigue. As the fifteenth installment, it continues to explore the rich tapestry of fae politics and personal relationships that have become the hallmark of McGuire's storytelling. For fans of the series, this book offers a satisfying blend of familiar elements and new developments, while also providing enough context for newcomers to find their footing in Toby's world.

The central premise of When Sorrows Come revolves around October "Toby" Daye's impending wedding to Tybalt, the King of Cats. This long-awaited event is a significant milestone in the series, as Toby's relationship with Tybalt has been a slow burn, evolving through trials and tribulations over the course of many books. McGuire deftly balances the personal and political stakes, as Toby's wedding plans are threatened by a plot to overthrow the High Throne, a conflict that could destabilize the entire Westlands.

One of the standout features of this novel is its exploration of themes of duty versus desire. Toby is a character who has consistently put the needs of others before her own, often at great personal cost. Her struggle to prioritize her own happiness, in the form of her wedding, while simultaneously addressing the larger political crisis, is a poignant reflection of the challenges faced by those who bear the weight of responsibility. McGuire skillfully portrays Toby's internal conflict, making her a relatable and empathetic protagonist.

Character development is another strength of When Sorrows Come. Toby's growth over the series is evident, as she has evolved from a reluctant hero to a formidable force in the fae world. Her relationship with Tybalt is a testament to this growth, as it is built on mutual respect, trust, and a deep understanding of each other's strengths and vulnerabilities. Tybalt, too, is given ample space to shine, as his role as the King of Cats is tested by the political upheaval. Their dynamic is one of the highlights of the book, offering moments of tenderness and humor amidst the chaos.

The supporting cast is equally well-developed, with familiar faces like Quentin, Toby's squire, and the Luidaeg, the sea witch, playing crucial roles in the unfolding drama. McGuire's ability to juggle a large ensemble of characters without losing focus is commendable, and each character's unique voice adds depth to the narrative. The interactions between these characters are often laced with wit and warmth, providing a counterbalance to the darker elements of the plot.

In terms of world-building, McGuire continues to expand the intricate universe of the fae with meticulous attention to detail. The political landscape of the Westlands is richly drawn, with the High Court in Toronto serving as a backdrop for the unfolding events. The author's ability to weave together elements of myth and modernity is evident in her portrayal of the fae courts, where ancient traditions coexist with contemporary challenges. This blend of the fantastical and the familiar is a hallmark of McGuire's writing, and it is executed with finesse in When Sorrows Come.

The novel's pacing is well-balanced, with a mix of action, intrigue, and introspection. McGuire's prose is both lyrical and accessible, drawing readers into the story with vivid descriptions and sharp dialogue. The tension builds steadily as Toby navigates the complexities of fae politics, culminating in a climactic confrontation that is both thrilling and emotionally resonant. The resolution is satisfying, providing closure to the immediate conflict while leaving room for future adventures.

Comparatively, When Sorrows Come shares thematic similarities with other urban fantasy series, such as Jim Butcher's Dresden Files and Patricia Briggs' Mercy Thompson series. Like Harry Dresden and Mercy Thompson, Toby Daye is a protagonist who must balance personal desires with larger responsibilities, often facing moral dilemmas and physical dangers. However, McGuire's focus on fae mythology and her nuanced exploration of relationships set her work apart, offering a unique perspective within the genre.

Overall, When Sorrows Come is a compelling addition to the October Daye series, offering a blend of romance, political intrigue, and fantasy that will appeal to both long-time fans and new readers. McGuire's skillful storytelling, rich character development, and intricate world-building make this novel a standout in the urban fantasy genre. Whether you're invested in Toby's journey or discovering her world for the first time, this book is a testament to McGuire's talent for crafting engaging and emotionally resonant stories.