Once Upon a Broken Heart by Stephanie Garber Review: Dark Fairytale Fantasy With Addictive Danger

Once Upon a Broken Heart centers on Evangeline Fox, a young woman whose lifelong faith in true love is shattered when Luc — the man she loves — announces he will marry her kind but distant stepsister, Marisol. Desperate and heartbroken, Evangeline turns not to friends or family but to the Prince of Hearts, one of the immortal beings known as Fates, a figure famed for his lethal kisses and his heart said to be waiting for revival by his one true love. The bargain they strike is deceptively simple on its surface: three kisses, given at times and places of the Prince of Hearts' choosing. What follows, as the publisher's synopsis makes clear, is a dark and magical journey in which Evangeline learns that the Prince of Hearts wants far more from her than she pledged — and that the outcome will be either "the greatest happily ever after, or the most exquisite tragedy." The novel is set partly in the mystical North, a region of Garber's broader Caraval universe steeped in fantastical creatures and lore that the earlier Caraval trilogy had only gestured toward.

Garber arrives at this series already established as a #1 New York Times and internationally bestselling author, with her Caraval trilogy translated into more than thirty languages. Once Upon a Broken Heart opens a four-book series and represents a deliberate expansion of her fictional world into new territory. The novel engages directly with fairytale archetypes — the desperate bargain, the wicked immortal, the hopeful heroine — while filtering them through the dark-romantic register that defined Caraval. For the young adult fantasy-romance genre, the book's central proposition (what lengths will someone go to for a happily ever after?) positions it within a tradition of morally complex fairytale retellings, though it is an original story rather than a direct retelling of any single source tale. Blurb praise from fellow authors reflects the book's reception in its genre community: Isabel Ibañez, herself a #1 New York Times bestselling author, describes it as "edgy, dark, and gorgeously written," calling it "heart-pounding, fresh, and addictive."

Kirkus Reviews, in its starred-verdict notice, credits the novel with thematic substance, noting that "the themes of love, the power of story, family influence, and holding onto belief are well rounded and add depth." The concept of the Fates as a functioning religious system within the world is singled out as a source of genuine interest. The plot is noted by Kirkus to contain "welcome surprises," and the large supporting cast generates curiosity. Critical coverage, as cited by the publisher, highlights Garber's "exquisitely imagined worldbuilding and her trademark heady romance" as defining assets. The novel is also structured around a single point of view — Evangeline's — a choice that, as noted by the book blog Bookish Wayfarer, tightens narrative suspense and sustains mystery throughout. Importantly, the book is written to stand independently for readers who have not encountered the Caraval trilogy, making it a genuine entry point rather than a sequel-in-disguise.

Kirkus Reviews is frank about the book's weaknesses. The writing style, the review notes, "fluctuates from clever and original to overly verbose and often confusing in its jumble of senses." World-building is identified as the more structural concern: "other fantasy elements are haphazardly incorporated without enough time devoted to building a cohesive world." The large cast, while intriguing, is noted as underdeveloped — readers are left wanting more time with characters who are introduced but not fully explored. These are not fringe reader complaints but the considered judgment of a major review outlet. On representation, Kirkus observes that Evangeline and several other central characters read as White, with diversity present among the fantasy races of the world rather than in the central human cast, though Luc is described as having brown skin.

Flatiron Books targets the novel at readers aged 13–18, and the Amazon grade-level designation of grades 7–9 reflects its positioning within the younger end of young adult fiction. Readers drawn to fairytale-inflected fantasy with a dark-romantic core, morally ambiguous supernatural figures, and an emotionally driven heroine will find the book engineered precisely for their tastes. Those who prioritize tightly constructed fantasy systems and restrained prose may find Garber's maximalist approach frustrating. For readers already fond of the Caraval series, the expansion into the North and the introduction of the Fates as foregrounded figures rather than background mythology offers substantive new territory. For newcomers, the book's self-contained accessibility makes it a viable starting point for one of young adult fantasy's most commercially successful ongoing series.