Pequeña gives birth to a baby boy at home, helped by Doña Agostina, while Pulga and Chico wait outside.

Pulga and Chico witness Don Felicio being murdered in the back room of his store.

Rey climbs through Pequeña's bedroom window, threatens her mother, and forces himself on her.

Nestor forces Pulga and Chico into his car at gunpoint on their way to school.

Rey conscripts Pulga and Chico as gang henchmen, revealing he knows they witnessed Don Felicio's murder.

Rey takes Pequeña to a deserted beach and gives her a diamond engagement ring.

Pulga uses hidden savings to buy three bus tickets; the teenagers flee Puerto Barrios secretly in the night.

The teenagers cross the Rio Suchiate and enter Mexico together.

Pulga, Chico, and Pequeña run alongside the moving La Bestia and climb onto the roof, boarding the train for the first time.

Armed men approach the moving train; migrants jump off, and Chico hits his head and loses consciousness.

Chico falls from a braking train, is crushed under the wheels, and dies in Pulga's arms.

A shelter priest convinces Pulga to bury Chico in a graveyard of migrants who did not survive the journey.

Pulga collapses from despair in the desert and refuses to move; the rest of the group walks on without him.

Border patrol agents find Pulga and Pequeña in the desert; Pequeña flees when an agent gives her a menacing look.

Pulga's father's sister arrives at the detention center to take guardianship of him, and they call Consuelo together.

Three teenagers—Pulga, Chico, and Pequeña—are forced to flee Puerto Barrios, Guatemala after witnessing a murder and falling under the violent control of gang leader Rey. They travel north by bus and river crossing, eventually boarding the dangerous freight train network known as La Bestia in hopes of reaching the US-Mexico border. The journey turns tragic when Chico, weakened by an earlier injury, falls from a braking train and dies, devastating Pulga and threatening to end the journey entirely. Pequeña pushes a broken Pulga forward through shelters and more trains until they reach the Sonoran Desert for a final crossing guided by a paid smuggler. Pulga collapses in the desert and is apprehended by border patrol while Pequeña flees alone into the night. Both survivors are separately rescued and begin to find tentative hope in the aftermath of their ordeal.

The essential journey from danger to survival.

Doña Agostina tells Pulga she had a vision of him, Chico, and Pequeña running, warning them to flee.

Pequeña tells Pulga and Chico that something bad is going to happen and that they must run.

Rey forces Pulga to make Chico beat him at the warehouse to prove the boys will follow any order.

Pequeña visits the drugstore and asks Leticia for medicine, a switchblade, and supplies for running away.

Pulga and Chico complete their first dangerous money-collection job for Rey, returning the cash without being killed.

Finding no transportation in Mexico after crossing the border, the teenagers spend the night hiding in a graveyard.

A priest at a migrant shelter gives a sobering talk on the extreme dangers of riding La Bestia north.

The van carrying the teenagers to Arriaga strikes a migrant trying to board, and the driver keeps going.

Shelter worker Soledad nurses Chico's concussion for a week and asks Pequeña what her new name will be.

A migrant loses both legs to the train wheels right before Pulga and Chico barely manage to board.

Pequeña pushes a grief-stricken Pulga to leave Chico's grave and continue the journey after weeks at the shelter.

A shelter proprietor in Altar charges extortionate prices and sets a vicious dog on the teenagers when they try to leave.

A nun brandishes a shotgun to drive off the dog and the proprietor, then stitches up Pulga's bite wound.

Pequeña arranges for a coyote through a fellow migrant and pays for the desert crossing with Rey's engagement ring.

Marta stops her car to rescue Pequeña, who has wandered near a road after surviving a night alone in the desert.

Before fleeing, both Pulga and Pequeña face warnings and pressures that harden their resolve to run—a midwife's supernatural vision, Pequeña's secret preparations at the drugstore, and Rey's brutal demands on the boys as gang errand runners. Once on the road, the teenagers encounter a series of harrowing secondary dangers: a hit-and-run by their own van driver, a tense scramble through woods at a police checkpoint, and a vicious dog attack in the town of Altar that drives them into the care of a gun-wielding nun. A shelter worker named Soledad provides crucial healing after Chico's concussion, and a fellow migrant in Altar helps Pequeña quietly arrange a coyote for the desert crossing. After Pulga is taken by border patrol, Pequeña wanders to a roadside where a woman named Marta stops to help her. These events reveal the hidden network of kindness and danger that shapes every step northward.

The hidden struggles behind each step of the journey.

Pulga and Chico burn their bloody clothes in secret to hide that they witnessed Don Felicio's murder.

Pequeña has a vision of Don Felicio at his own wake gesturing toward the boys and urging her to run.

Pulga tells Chico they must leave Guatemala and retrieves the money Consuelo secretly saved for his escape.

Pequeña cuts her hair and dresses in men's clothes to disguise herself before meeting the boys at the bus station.

Pulga realizes at a migrant shelter that Pequeña is also fleeing Rey and that Rey fathered her baby.

The teenagers pray together before a painted mural of La Virgen at the shelter, and Pulga aches for his mother.

Migrants abandon their van and hide in dark woods at a police checkpoint to avoid immigration authorities.

Pequeña has a vision of looking down on the train tracks from above and seeing severed limbs and scattered belongings.

A couple from the train helps Pulga and Chico climb into an open boxcar after armed men force everyone off the roof.

A shelter priest offers to bury Chico in a local graveyard and promises to pray there for him every day.

Pequeña appeals to Pulga's surviving spirit at a slow bend in the train tracks, and he agrees to keep walking.

Coyote guide Gancho gives blunt survival instructions to the group before leading them into the desert on the first night.

Pulga finds Nene alone in a migrant detention cage, separated from his mother and uncertain whether his father survived.

Pequeña learns that Marta, the woman who rescued her, is the sister of Soledad, who nursed Chico back to health.

Pequeña tells Marta her name is Flor and feels the first genuine stirrings of relief and hope.

In Puerto Barrios, a series of small but decisive moments—burned clothes, a supernatural vision at a wake, a secret stash of escape money—set the teenagers on a path they cannot reverse. As the journey unfolds, Pulga discovers the full truth of Pequeña's situation at a migrant shelter, while each checkpoint and boxcar escape forces new reckoning about what survival costs. Chico's death is the story's emotional breaking point, and a priest's compassionate offer to bury him in a graveyard of fellow migrants brings painful but necessary closure. In the desert, a coyote's blunt instructions and Pequeña's desperate last appeals to Pulga's spirit push both characters to their absolute limits. After their separation, Pequeña's discovery that her rescuer is unexpectedly linked to someone from earlier in the journey suggests a thread of fate running through the novel. Her final act of claiming the name Flor signals a hard-won transformation from victim into survivor.