Is ‘The Map Of Longing’ Based on a True Story, Here Is What Inspired Greta and Lucy’s Journey

Netflix has spent the past week rolling out ‘The Map of Longing’, a Spanish-language tearjerker that dropped all six episodes at once on July 17. The series follows Greta as she processes the loss of her older sister Lucy to leukemia through a handmade game Lucy left behind before she died, and the raw specificity of that grief has left plenty of viewers wondering just how much of the story is pulled from real events.

The short answer is that ‘The Map of Longing’ is not based on a true story in the literal sense. The series is adapted from Alice Kellen’s bestselling novel ‘El Mapa de los Anhelos’, a work of fiction published by Editorial Planeta as one of the Valencia-based author’s many self-contained romance novels.

That does not mean the story was invented entirely out of thin air. Kellen has spoken about researching real family dynamics while writing the book, explaining in an interview with FANFAN that she looked into how a family unit actually functions when one sibling is seriously ill, including how the healthy sibling experiences that reality and how parents navigate the daily strain of it.

Kellen has also acknowledged that the novel came from a genuinely difficult period in her own life. Speaking to El Español, she described writing the book during a complicated stretch, and framed the story’s central metaphor, a literal map guiding someone back toward their own forgotten dreams and purpose, as something she wished more people had access to in their own lives.

That research shaped how the Greta and Lucy relationship was written, particularly the guilt and identity questions that follow Greta throughout the story. Greta spends much of her life believing she was born specifically to save her sister through a stem cell donation, a premise that pulls directly from real medical situations even though the characters and their specific circumstances are entirely fictional.

Kellen has also pushed back on the idea that Greta’s parents are portrayed as neglectful toward their healthy daughter. In that same FANFAN interview, she explained that she never intended to depict the parents as rejecting Greta, but rather as doing the best they could while organizing family life around whichever child needed more attention at any given moment, in this case Lucy.

The novel itself is part of a broader catalogue Kellen has built with recurring themes of grief, identity, and self-discovery, following earlier hits like ‘Nosotros en la Luna’ that established her as one of the most read romance authors in Spain. ‘El Mapa de los Anhelos’ notably breaks from some of her earlier work by placing a sibling relationship at the emotional center of the story rather than focusing purely on romantic love.

For the Netflix adaptation, screenwriter Isa Sánchez and directors Laura M. Campos and Gemma Ferraté translated that source material to the screen with Alícia Falcó and Pablo Álvarez leading the cast as Greta and Will. While the show takes some creative liberties in adapting nearly 500 pages of the novel into six episodes, the emotional core Kellen built from her own research and personal experience remains intact.

So while no single family’s real story directly inspired ‘The Map of Longing’, the grief, guilt, and love at its center were clearly built from something genuine, even if the characters themselves are entirely invented. Did knowing the real research behind the story change how you experienced the show, and what other Alice Kellen novel would you want to see adapted next? Let us know in the comments.