Once Upon a Broken Heart: Plot, Spice, Age Rating & Reading Order

Every reader who picks up Once Upon a Broken Heart arrives with the same question: is this the kind of romance you can share with your teenager, or the kind you read alone? The answer depends on what you’re looking for—and this guide lays out the plot, the spice level, the age recommendations, and the reading order so you can decide for yourself.

Author: Stephanie Garber ·
Published: September 28, 2021 ·
Series: Once Upon a Broken Heart #1 ·
Pages: 416 ·
Goodreads rating: 4.2 / 5

Publisher and retailer sources confirm these essential facts about the book.

What is Once Upon a Broken Heart about?

Setting and main character

The story follows Evangeline Fox, a young woman who believes in true love and happily-ever-afters. When the boy she loves plans to marry someone else, she makes a desperate decision. The world is a lush, magical realm connected to the Caraval universe, filled with fae tricksters and enchanted bargains (The Story Sanctuary).

The deal with the Prince of Hearts

Evangeline strikes a deal with Jacks, the Prince of Hearts—a fallen fae prince who grants wishes at a terrible cost. Jacks is charismatic, dangerous, and bound by his own cursed nature. The bargain sets off a chain of events that forces Evangeline to question everything she thought she knew about love and trust (Rated Reads).

What this means: the book operates in two modes at once—it delivers the swoony, magical atmosphere of a classic fairy tale while quietly undermining the idea that love alone solves everything.

Is Once Upon a Broken Heart a spicy book?

What “spice” means in YA fantasy

In YA reader communities, “spice” refers to the level of explicit sexual content. On a scale from “clean” (no physical intimacy beyond kissing) to “explicit” (on-page sex scenes), most YA fantasy romance lands in the low-to-moderate range. Once Upon a Broken Heart falls squarely at the low end (Rated Reads).

Presence of explicit or closed-door scenes

Multiple independent reviewers confirm that no explicit sex scenes appear in the book. Rated Reads notes “sexual content is fairly minimal” and describes the romance as “several kissing scenes” with nothing on-page beyond that (Rated Reads). Screenwise App characterizes the romance as “heavy on tension and kissing but still clean” and explicitly calls it a “clean romance” (Screenwise App). The Story Sanctuary confirms kissing between a boy and a girl, but nothing more explicit (The Story Sanctuary).

The implication: if you’re looking for a romance with heat, this isn’t it. If you want romantic tension, chemistry, and emotional stakes without explicit content, the book delivers exactly that.

Is Once Upon a Broken Heart appropriate for 13 year olds?

Publisher’s age recommendation

Target’s product page lists the book as Young Adult Fiction with a suggested age range of 13 to 19 years (Target). The Story Sanctuary recommends ages 14 and up, noting mild profanity and romantic tension as factors (The Story Sanctuary). Screenwise App sets a slightly lower floor at ages 12 and up (Screenwise App).

Content warnings and themes

The book deals with heartbreak, betrayal, magical curses, and the consequences of making bargains with dangerous fae. There is mild profanity used infrequently (The Story Sanctuary), and Evangeline drinks wine at a social event (The Story Sanctuary). No violence is graphic, and the romantic content stays within YA boundaries—kissing and emotional tension, nothing explicit. Goodreads reader discussions consistently note that a 13-year-old can read the book depending on maturity, but parental guidance is recommended (Goodreads Q&A).

The catch: there is no single “yes” or “no” answer from the publisher. The official age band (13–19) leaves the door open, and the final call depends on the individual reader’s maturity and sensitivity.

Do I need to read Caraval before Once Upon a Broken Heart?

Connections between the series

Once Upon a Broken Heart is a spin-off set in the same universe as Stephanie Garber’s Caraval trilogy. Jacks, the Prince of Hearts, first appeared in the Caraval books, and the new series references characters and locations from that world (Rated Reads). However, the plot of Once Upon a Broken Heart stands on its own—you don’t need Caraval knowledge to follow Evangeline’s story.

Reading order recommendations

Readers who start with Once Upon a Broken Heart without reading Caraval first will still understand the main storyline. The book introduces Jacks as if he’s new, and the central conflict does not depend on prior events. That said, readers who have finished the Caraval trilogy will catch subtle references and understand Jacks’s backstory more deeply (The Story Sanctuary).

The trade-off: reading Caraval first adds context but costs about 1,200 pages of reading time. For a teen who just wants a standalone fantasy romance, starting directly with Once Upon a Broken Heart works fine. For a dedicated fantasy reader who enjoys layered worldbuilding, the Caraval trilogy enriches the experience.

What is the saddest romance book ever?

Four books, one pattern: the titles most frequently called “the saddest romance” share a willingness to let love end in loss rather than reunion. Once Upon a Broken Heart takes a different path.

What this means: Once Upon a Broken Heart is not in the running for the saddest romance—and that’s by design. Its emotional core is hope, not loss. Readers who want a romance that leaves them feeling optimistic rather than wrecked will find the book better suited to that mood.

Upsides and downsides

Confirmed facts and open questions

What’s confirmed

• The book is published by Flatiron Books and marketed to young adults aged 13+ (Target)
• Explicit sex scenes do not appear in the text (confirmed by multiple reader reviews and the publisher’s YA classification) (Rated Reads)
• Jacks, the Prince of Hearts, is a fae character who makes bargains with humans (Rated Reads)
• The series consists of three books, all published as of 2023 (The Story Sanctuary)
• The Story Sanctuary describes the main characters as white (The Story Sanctuary)

What’s still unclear

• Whether the publisher explicitly assigns a content rating like “spice level”—no official rating exists beyond the YA label (Target product page)
• Whether a 13-year-old’s maturity level is suitable for the romantic tension—parental guidance is recommended rather than a blanket age cutoff (Goodreads discussion)

What the author says

“I wanted to write a fairy tale with a dark edge—one where the prince isn’t necessarily good and the girl isn’t necessarily helpless.”

Stephanie Garber, interview with Epic Reads

“Desperate to stop the wedding and to heal her wounded heart, Evangeline strikes a deal with the charismatic but wicked Prince of Hearts.”

Official synopsis, Goodreads

Frequently asked questions