Their Will Undone

R J Valldeperas

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Book cover for Their Will Undone
Image for variant 9780063388741
Book cover for Their Will Undone
Image for variant 9780063388741

Their Will Undone

Their Will Undone

R J Valldeperas

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Description

A debut YA fantasy must-read for fans of The Winner's Curse, What the River Knows, and This Woven Kingdom.

When a maiden is selected to marry the emperor, her journey to the palace will see her fighting both a spark of magical power and her growing feelings for her broody escort in this romantic fantasy duology opener, inspired by a true story from the Inca empire.

In Amaru, it is an honor to be chosen in the annual harvest and serve the gods'-favored emperor. Nina's brother has already been chosen, but when the emperor's men come a second time for her sister, Nina volunteers instead. She is taken to the acllahuasi, a gilded cage where women train to become servants or wives for the ruling class. It is there that a soldier comes to collect her, and Nina learns of her fate--to become a wife...to the emperor.

As the emperor's trusted friend and soldier, Kasik is ordered to retrieve Nina and deliver her untouched. But the emperor's betrothed is not as he expected. The distrust between Nina and Kasik is thicker than the trees surrounding them, and Kasik's honor is put to the test when their path back to the capitol leads them into dangerous territory. Their lives and hearts are in peril as forbidden desires are unearthed, along with a stirring of dark magic in Nina that inexplicably ties her to the gods.

What begins as a simple task becomes a tense journey that forces Nina and Kasik to confront where their true loyalties lie--with the emperor and the fate of their people, or with the desires of their own hearts.


  • Historical Inspiration: This story was inspired by the Inca Maiden of Llullaillaco.
  • Betrothed's Best Friend: When Nina arrives to the capital city, she'll be married to the emperor of Amaru--who happens to be Kasik's best friend.
  • Forbidden Romance: Nina is engaged to the emperor. Kasik is a soldier in his army. Even so, they can't deny the sparks that erupt between them.
  • Forced Proximity: Nina and Kasik must work closely together to travel across the dangerous terrain leading to the capital.

Critical Reviews

"Rich with history, myth, and longing, this story swept me away from the first page. Nina's journey is as devastating as it is empowering, and the world Valldeperas has created feels ancient, dangerous, and alive. A stunning debut." - #1 Bestselling author Renèe Ahdieh

"A fierce debut steeped in ancestral magic, betrayal, and defiance, Their Will Undone is a powerful exploration of what happens when we reclaim our fate and fight back against those who seek to control us. Valldeperas spoke truly when she described this book as not just a coming-of-age story, but a coming-of-rage." - Angela Montoya, award-winning and critically acclaimed author of A Cruel Thirst

Their Will Undone is an emotional rollercoaster of a debut that perfectly blends rage and resistance, compliance and cowardice, loyalty and love. This story is powerful and addictive from the first page to the explosive conclusion that will leave you desperate for the next book! - Kamilah Cole, Dragon, Lambda, and Lodestar Award-nominated author of the bestselling Divine Traitors duology

"R. J. Valldeperas's Their Will Undone is a stunning YA fantasy debut about sacrifice, loyalty, and the rage of a girl who refuses to surrender her fate. Fiercely romantic, epic, and unputdownable!" - Logan Karlie, NYT Bestselling Author of Dream by the Shadows

"Their Will Undone is an absolute powerhouse of a book. Dripping with rich and imaginative world building, Valldeperas crafts an utterly unique debut about the power of resistance and the sacrifices we're willing to make to carve our own fate." - I. V. Marie, bestselling author of Immortal Consequences

"Third-person narration shifts focus between Kasik and Nina, skillfully building this expansive, politically fraught world while still giving an intimate look at two complex, emotional leads. A gut-punch of an ending will leave readers heartbroken and breathlessly awaiting the sequel." - BCCB

"Inspired by the fate of the Maiden of Llullaillaco, this story levitates with its fierce rage. A thrilling read." - Kirkus Reviews

"An opulent Inca-inspired fantasy for fans of Tahereh Mafi's This Woven Kingdom with a simmering, high-stakes romance. A strongly plotted debut with incredibly compelling worldbuilding. Highly recommended."

- SLJ, starred review

Publishing Information

Publisher: HarperCollins
Pub date: 2026-06-02
Length: 368 pages

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