Monstrilio Ending Explained: The Monstrilio's Fate and the Family's Final Resolution

⚠️ Spoiler Warning: This guide contains detailed spoilers for the entire novel. Proceed only if you've finished reading or are comfortable knowing the plot.

The Literal Account

Monstrilio opens in the aftermath of death. In the family's secluded Upstate New York house, Magos and Joseph lie beside their dead son Santiago in his child-sized bed. Santiago was born with a single lung — a condition that carried him well past his expected life span but ultimately couldn't save him. Magos reflects that his death lacks the drama she once imagined, recalling a fantasy of him dying in a Mexico City mall where she would be an object of public sorrow, a Pietà, marble and gorgeous. Instead, there is no thunder, no angels weeping, no cloaked Death, no grace — just his silent body, unbreathing, and the blunt realization that this is it.

Joseph grieves physically, squeezing the boy's body, nuzzling his neck, breathing him in hard. Magos watches him and thinks that perhaps her husband can die of grief — he is romantic. She folds her husband's body, walks him to their bed, and returns to their son alone.

Their son is only hers now, the narration states.

Alone with Santiago, Magos licks his ear like an animal would. She studies his cream-colored pajamas with silly dinosaurs, noting the thinning patches where the material has wearied. She wants to learn one last secret from her son: what part of a person's body is inextricably themselves. Not hair — too public and not a secret. Not his fingers or toes, which she knows well. Not his heart. It has to be his lung — the single lung that defined his Santiagoness, the core of who he was.

She makes an incision in his abdomen with a sharp knife. The procedure is messy — his heart does not pump anymore, so what oozes out is the blood his veins already carried. She finds the lung toward the right of his chest, lighter and more inconsequential than she thought it would be. She wants to rip it out and keep it for herself, but she decides her son should keep his lung. She slices off only the downmost tip with a paring knife and places it in a clear jam jar her son used to keep pencils in.

She reassembles his body as best she can, wipes the blood with a piece of sheet soaked in her saliva. Her husband returns, freezes at the scene, and says, You've destroyed him. She finds the word destroyed curious — she has destroyed nothing; nothing was left to destroy.

This is the novel's inciting incident. The lung tip in the jam jar is the seed of the Monstrilio — the creature that gives the novel its title. The title and the thematic framework established in this opening scene point toward a story about what happens when grief refuses to let go.

What the Opening Sets Up

The opening chapter establishes the central conflict that drives the novel: Magos's refusal to accept Santiago's death and her decision to preserve a piece of him. The lung tip in the jam jar is the novel's central object — the seed of the Monstrilio. The title itself signals that this preserved piece of Santiago will grow into something monstrous, and the novel's central question becomes: what happens when grief takes physical form?

The opening also establishes the key relationships that will shape the novel's trajectory:

Magos — the mother who refuses to let go. Her grief is not performative; it's bodily and instinctual. She licks her son's ear, savors his blood (a taste of iron and warmth), and understands the vampire's craving to drink deep. Her grief is primal, and her decision to preserve a piece of Santiago is an act of defiance against death itself.
Joseph — the father who grieves physically but conventionally. He squeezes his son's body, nuzzles his neck, and collapses into bed. His grief is visible and legible, in contrast to Magos's. His reaction to Magos's act — You've destroyed him — sets up a fundamental conflict between the two parents about what it means to honor the dead.
Santiago — the dead son whose single lung defined his life. He is present in the novel primarily through memory and through the preserved lung piece. His Santiagoness — the quality that made him himself — is what Magos is trying to preserve.

The Monstrilio's Fate

The novel's title and the opening scene establish that the lung tip in the jam jar grows into the Monstrilio — a creature that embodies Magos's grief and her refusal to let go. The Monstrilio's fate is the novel's central question, and the available evidence doesn't provide a definitive answer. However, the thematic framework established in the opening suggests several interpretive possibilities:

The Monstrilio as grief made flesh: If the creature represents Magos's grief, its fate may mirror the trajectory of grief itself — growing, consuming, and eventually needing to be released.
The Monstrilio as Santiago's second life: If the creature is a continuation of Santiago in some form, its fate may represent the family's attempt to hold onto their son beyond death.
The Monstrilio as a test of the family's bonds: The creature's presence in the household would inevitably strain the relationships between Magos, Joseph, and anyone else who enters their orbit.

Major Character Outcomes

Based on the opening chapter and the thematic framework, the novel's major characters face the following trajectories:

Magos — The opening establishes her as the novel's driving force. Her decision to preserve a piece of Santiago sets everything in motion. Her arc likely involves confronting the consequences of that decision — whether the Monstrilio brings her closer to her son or pushes her further from him.

Joseph — His reaction to Magos's act — You've destroyed him — establishes him as the voice of conventional grief. His arc likely involves reconciling with Magos's choice and finding his own way to grieve.

Santiago — Though dead, Santiago remains central to the novel through the preserved lung piece. His Santiagoness — the quality Magos is trying to preserve — is the novel's emotional core.

Resolved and Unresolved Threads

The opening chapter establishes several threads that the novel must address:

Resolved:

The immediate aftermath of Santiago's death — the opening scene shows the family in the first hours after his death, with Magos's act of preservation serving as a kind of resolution to the question of what she will do with her grief.

Unresolved:

The fate of the lung piece in the jam jar — whether it grows into the Monstrilio and what happens to it.
The relationship between Magos and Joseph after Magos's act.
Whether the family can find peace after Santiago's death.

Theme Resolution

The novel's themes, as established in the opening, point toward a resolution that engages with:

Grief as bodily instinct — Magos's grief is physical: she licks her son's ear, savors his blood, understands the vampire's craving. The Monstrilio itself is a physical manifestation of this bodily grief. The novel's resolution likely involves confronting what it means for grief to take physical form.

Imagined versus real death — Magos's fantasy of Santiago dying in a Mexico City mall contrasts sharply with the reality of his death in their secluded house. The novel's resolution likely involves reconciling these two versions of death.

The solitude of parental grief — Magos's grief is solitary; even her husband can't fully share it. The Monstrilio may represent both the solitude of her grief and an attempt to break that solitude.

Ownership of the dead — Magos's act of cutting into her son's body raises questions about who owns the dead. Joseph's accusation — You've destroyed him — frames this as a violation, but Magos sees it differently: she has destroyed nothing; nothing was left to destroy.

Preservation as defiance — Magos's decision to preserve a piece of Santiago is an act of defiance against death. The novel's resolution likely involves exploring whether this defiance is sustainable or whether it must eventually give way to acceptance.

The Epilogue

The available evidence doesn't include an epilogue, so I can't comment on one. The novel's ending — whatever form it takes — builds on the opening scene's themes and conflicts.

Reasonable Interpretations

Without access to the full text, I can offer interpretive frameworks based on the opening chapter and the novel's thematic concerns:

The Monstrilio as grief itself: The creature may represent grief in its most raw, consuming form — something that grows, demands attention, and eventually must be faced or released.
The Monstrilio as Santiago's second life: The creature may be a continuation of Santiago in some form — a way for Magos to keep her son alive, even if monstrously transformed.
The Monstrilio as a test of love: The creature's presence may test the family's bonds — whether love can survive the monstrous consequences of grief.
The ending as acceptance: The novel may ultimately move toward acceptance — Magos learning to let go of the Monstrilio as she learned to let go of Santiago.

Reader Questions

Q: Does the Monstrilio survive to the end of the novel?

A: The available evidence doesn't provide a definitive answer. The novel's title and opening scene establish the Monstrilio as the central object of the story, but its ultimate fate requires reading the full text.

Q: What happens to Magos and Joseph's marriage?

A: The opening establishes a fundamental conflict between the two parents — Joseph's accusation that Magos destroyed their son versus Magos's belief that nothing was left to destroy. The novel's resolution of this conflict isn't covered in the available evidence.

Q: Is the Monstrilio actually Santiago?

A: The opening establishes that the lung piece is the core of his Santiagoness — the quality that made Santiago himself. Whether the Monstrilio that grows from this piece is literally Santiago is an interpretive question the novel addresses.

Q: Why does Magos cut into her son's body?

A: The opening makes clear that Magos wants to possess the core of his Santiagoness — the single lung that defined her son's life. Her act is an attempt to preserve what made Santiago himself, even after death.

Q: Does the novel end with the family finding peace?

A: The available evidence doesn't provide a definitive answer. The novel's themes — grief, ownership of the dead, preservation as defiance — suggest that peace, if it comes, must be earned through confronting the consequences of Magos's act.

Q: What is the significance of the jam jar?

A: The jam jar is the container for the lung piece — the seed of the Monstrilio. It's a mundane object, a pencil jar from Santiago's childhood, which contrasts with the monstrous thing it will contain. This contrast is central to the novel's exploration of how ordinary grief can produce extraordinary consequences.