Darker than Blue by H.L. Dawson
My rating: 5 of 5 stars

A powerful sequel that deepens the world and the relationships

Darker Than Blue takes everything that worked in the first book and expands it in meaningful and emotional ways. Returning to Mizu’s drowned world feels both familiar and more dangerous, as the story dives deeper into the mysteries surrounding the Sirhunue, their origins, and Mizu’s own place among them.

One of the things I loved in the first book was the worldbuilding, and that continues to shine here. The underwater setting still feels vivid and haunting, filled with crumbling domes, lost technology, and secrets buried beneath the ocean floor. The journey to Boba 3 in particular adds a darker, almost mythic atmosphere to the story. The idea of the Iron Womb—an ancient machine once responsible for creating the Sirhunue but now corrupted and producing terrifying abominations—is both eerie and fascinating. It adds another layer of depth to the already rich setting.

But what really makes this sequel stand out is how much the relationships develop. The bonds between Mizu, Fin, and Mako become far more complicated as the story progresses. The tensions between them feel natural and believable, shaped by secrets, loyalty, and feelings that aren’t always easy to confront. Watching those relationships evolve—sometimes strengthening, sometimes straining under pressure—adds a strong emotional core to the story.

Mizu herself continues to be a compelling protagonist. As she begins to uncover the truth of her heritage and her connection to the Sirhunue, the story explores themes of identity and belonging in thoughtful ways. Being caught between two bloodlines and two possible destinies forces her to question everything she thought she knew about herself and her world. Those internal conflicts give the story a lot of weight, especially as the stakes continue to rise.

Another element that stood out to me was the reappearance of Mizu’s mother. Their fractured relationship adds a deeply personal dimension to the narrative. After years of silence and grief, being forced to confront that history and rebuild trust is no easy task. The emotional tension in those moments helps ground the larger, more epic elements of the plot.

As the story unfolds, the boundaries between human and Sirhunue begin to blur, and the ocean itself seems to be shifting in response to the choices being made. The sense that everything is building toward something larger—something that could reshape the fate of Mizu’s people—keeps the tension high throughout the book.

Overall, Darker Than Blue is a fantastic sequel that deepens the mythology of the series while strengthening the emotional connections between the characters. Readers who enjoyed the first book will likely appreciate how the story expands here, exploring identity, loyalty, and the complicated ties that bind people together.

A gripping continuation of Mizu’s journey, and one that leaves me eager to see where the story goes next.

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