Eleven-year-old Angel Morgan lives in a run-down apartment in Burlington, Vermont, where she serves as the primary caretaker for her seven-year-old brother, Bernie. Their mother, Verna, comes home at unpredictable hours, while their father, Wayne, is in prison. One evening, after Angel douses a couch fire Bernie starts with matches, she spots a single star and urges Bernie to wish their father home. Bernie instead wishes Wayne will never come back.
The next morning, the family drives to the prison for their regular Saturday visit. Angel carries emergency taxi money in her socks and wears her apartment key on a string, habits born from Verna's pattern of forgetting or abandoning them. Wayne appears diminished, his smile forced. Bernie refuses to speak to him. Afterward, Verna announces they are leaving Burlington for good. Bernie celebrates, but Angel feels sick, convinced his star wish has come true.
Verna packs the children's belongings into one suitcase each and drives them out of the city. Angel clutches Grizzle, a large blue plush bear Wayne gave her before prison. The truck gets a flat tire with no spare, and Verna's credit card is maxed out, so she calls an unknown man who pays for the repair. After getting lost on back roads, Verna brings them to a dilapidated farmhouse on Morgan Farm Road, the home of Wayne's grandmother. Inside the dark kitchen, they meet their great-grandmother, a frail old woman bundled in blankets in a rocking chair.
Through the stairway, Angel overhears Verna tell Grandma they will stay "no more than a week." That night, Angel wakes to the sound of the pickup driving away. Verna's bed has not been slept in, and no clothes remain. Angel tells Bernie that Verna went back to Burlington to clean out the apartment, but when she calls their old number, it has been disconnected. The promised week passes with no return and no word.
Unable to sleep one night, Angel goes outside and is overwhelmed by the star-filled rural sky. A tall, bearded man with a telescope approaches her. He knows her name and says he held her up to see the stars when she was tiny. He shows her Jupiter and its moons, then pinches her arm and tells her the material she is made of is "the same stuff as stars," the same elements forged in distant suns. Angel returns to the house trembling with this revelation.
Angel finds moldy encyclopedias in an old sugar shack on the property and takes the volume on astronomy. She walks Bernie two miles to the village store and rations Grandma's meager funds. On Saturday, she dials the prison and tells Wayne that Verna left them. Wayne is furious and threatens to contact Welfare. Angel begs him not to, insisting she can manage. The strain finally breaks her: She cries in huge sobs, releasing accumulated fear and grief. When she wakes, she accepts that being responsible is the center of her life, with two people now depending on her.
She and Bernie discover the village library, run by Miss Liza Irwin, a kind, severely hunched old woman. Miss Liza reads Bernie a picture book, and he laughs uncontrollably, his first real joy since arriving. Angel borrows
Know the Stars by H. A. Rey, whose welcoming tone makes her feel for the first time that someone believes she can learn. When Angel mentions wanting a book about stars, Miss Liza says quietly that they must share "a mutual friend," confirming she knows the star man.
Grandma rides the bus with Bernie on the first day of school and stays in his classroom all day, bonding with him deeply. At the middle school, Angel navigates her eighth school in six years and maintains the lie that Verna is home with back trouble. A classmate named Megan Armstrong confronts Angel, asking if her father is the Wayne Morgan who robbed a store in Barre. Overhearing girls in the bathroom, Angel learns for the first time that Wayne shot a store clerk during the robbery. She sustains herself through nightly stargazing with the star man, who patiently teaches her constellations.
One afternoon, the elementary bus passes without stopping. Angel calls the school and learns that Verna signed Bernie out for a supposed doctor's appointment. Angel is devastated not only by Bernie's disappearance but by the question of why Verna chose him and not her. Grandma holds Angel on her bony lap and rocks her, the first time Angel can remember being comforted. Miss Liza offers to trace Bernie through a library contact and shares Psalm 8, about being "a little lower than the angels, crowned with glory and honor."
The school librarian gives Angel
Starry Messenger by Peter Sís, a picture book about Galileo Galilei. That night, Angel goes to share it with the star man, but he is gone. She spirals into grief, feeling abandoned by yet another adult. The next afternoon, Wayne steps out of the trees. He has escaped from a prison work crew and hides in the sugar shack, revealing a plan to take Angel to Florida to spite Verna for taking Bernie and asking her to steal Grandma's Social Security money. Instead of going, Angel hides in the star man's empty trailer and watches through the window as Wayne waits, then finally leaves in a car. She sits frozen until nearly morning, having chosen to stay.
A hospital calls to say that Ray Morgan is about to have an operation. Angel realizes the star man is Grandma's son. Grandma insists Ray is effectively dead, that the man who returned from Vietnam was unrecognizable: He stole from her, and she threw him out repeatedly, though she eventually let him live in the trailer at Miss Liza's urging. Angel tells Grandma that Ray taught her about the stars and that children need their mothers no matter how old they are. Grandma refuses to go but reveals the full weight of her history: Both her sons went to Vietnam, returned with addictions, and ended up in prison. Wayne's mother abandoned him as a baby with Grandma. Grandma blames herself for failing every generation.
Miss Liza's nephew Eric drives Angel to visit Ray in Intensive Care. Ray tells Angel to have his telescope and asks her to think of him returning to stardust. He dies after the operation. At the funeral, as the minister says "Dust to dust," Angel silently amends: stardust to stardust. Grandma stops eating, sinking into guilt. Angel cajoles her back to life. Miss Liza reads Angel Robert Frost's poem "Take Something Like a Star," about fixing one's mind on a star when the world sways.
A social worker named Mrs. Morris arrives after Wayne, now caught by police, reported that Verna deserted Angel. Angel argues that she and Grandma are managing well and directs the social worker to Miss Liza, Grandma's lifelong rival, as a character reference. Grandma is horrified, but Angel assures her Miss Liza will say only good things.
Near Thanksgiving, Bernie calls from a hospital with a broken leg after a car wreck caused by Verna's boyfriend, who had been drinking. Verna is also hospitalized. Eric drives Angel and Grandma to visit. Angel goes alone to the ICU, where Verna apologizes and says the children would be better off without her. Angel tells Verna firmly that she is the mother and Angel is just the kid, and Verna must get well and come home. A spark of life returns to Verna's eyes.
In early December, Angel wraps Bernie in a quilt outside so he can see the sky despite his weakened leg. He insists on wishing on what Angel tells him is a planet. He wishes Verna will never leave again. Angel wishes for the whole family to be happy, including Wayne. Bernie admits that having Verna to himself felt wrong without his sister. Angel tells him they must stick together because they are a family. Bernie asks what makes the stars shine. Angel answers that they are on fire, and the fire of the stars sparkles in his eyes.