There is a particular kind of grief that lives in the body of a woman who has given everything and still comes up short. The grief of the immigrant mother, the abandoned daughter, the working-class Latina who crossed an ocean chasing a promise that was never really hers to keep. Ceniza en la Boca (Ashes), the fourth feature from director Diego Luna, understands grief in its bones as it premiered in the Special Screenings section of Cannes 2026. After nearly a decade, Luna makes a quiet return to fiction filmmaking. This film is not the work of a director proving himself. It is the work of one who has something urgent to say and has found exactly the right story to say it through.

The film centers on Lucila (Anna Díaz), 21, who travels to Spain with her younger brother to reunite with their mother, Isabel (Adriana Paz), who left eight years earlier. Once there, she faces a question that refuses to release her: Where do I belong in a world shaped by classism, racism, and misogyny?

Unfolding across Mexico City, Madrid, and Barcelona, the film follows Lucila as she attempts to reconstruct a family bond that distance and silence have quietly dismantled, only to find a world with no interest in making space for her and a mother whose survival has come at a cost neither of them fully understands yet.

Díaz is a revelation. She carries Lucila’s quiet devastation with a restraint that never tips into passivity. Every glance, every hesitation, every bitten-back word is a heavy lift for a young woman who spent years rehearsing what she would say when she finally got here. Díaz makes you feel every contradiction – the longing, the resentment, the love, and the exhaustion – without ever overstating a moment.

Adriana Paz proves once again that she is one of the most nuanced performers in Latin American cinema, having made history at Cannes as the first Mexican actress to win Best Actress for her role in Emilia Pérez. She embodies Isabel as an absent mother whose silence becomes the film’s emotional pulse. She’s neither villain nor martyr, but a woman who made an impossible choice and has been quietly paying for it ever since. The tension between Díaz and Paz is electric precisely because Luna refuses to hand either woman an uncomplicated redemption arc.

What lingers longest after Ceniza en la Boca is not any single scene. It is Lucila herself. The film leaves you with a haunting, aching longing on her behalf, a need to reach through the screen and give this young woman permission to simply live. She is twenty-one, but she moves through the world as if she were forty, weighed down by responsibilities that would break a more seasoned woman.

She is the daughter searching for her mother, the surrogate parent keeping her younger brother afloat, the breadwinner, the peacemaker, the emotional anchor for a fractured family that was never meant to be her burden. Even her attempts to claim a slice of a normal young woman’s life via a fleeting romance end in disappointment.

And yet, in unguarded moments – a brief laugh, a stolen glance at something beautiful – you see the girl she could have been. The girl she still wants to be. Those flickers of a freer life make the film devastating. It is not that Lucila is without hope. It is that her hope is so carefully rationed, so braced against disappointment, that watching her dare to want more feels almost unbearable.

Luna frames these moments with remarkable restraint, never sentimentalizing Lucila’s yearning. He simply keeps the camera focused on Díaz long enough for the audience to experience the emotions themselves. That trust in his actor and in his audience is the mark of a director who is fully in command of his craft.

At its core, Ceniza en la Boca is a film about what migration costs and who pays the hidden bill. Here, the structural violence of classism, racism, and misogyny serves as the foundation of Lucila’s existence. The film also excavates the particular strain immigration places on the mother-daughter bond. Isabel did not leave out of cruelty but out of desperation, believing sacrifice now meant something better later.

But sacrifice, the film argues, has a shelf life. When it expires, what remains is not gratitude but grief. The distance between Isabel and Lucila is not merely geographic – it is the distance between a mother who hardened herself to survive and a daughter left to grow up in the shape of that absence. No one feels that gap more acutely than Diego (Sergio Bautista), the younger brother caught between the two women, between Mexico and Spain, between the family he remembers and the one that remains.

These women are not symbols. They are not cautionary tales. They are full human beings navigating systems not built for them, loving each other imperfectly, and carving out whatever dignity is left after the world takes its cut.

Where the film stumbles is pacing. The Barcelona sections of the second act lose urgency precisely when the tension should be tightening. Ceniza en la Boca is so committed to living alongside its characters that it occasionally forgets to push them forward. A tighter edit would have made this film devastating from first frame to last, rather than in the sustained, accumulating delivery it ultimately achieves.

But that accumulation is real. And it lands.

Netflix has acquired distribution rights for Ceniza en la Boca. When it arrives, clear your schedule. Lucila’s story will stay with you long after the credits roll, not because it resolves neatly, but because it doesn’t. And neither does life.