June 30, 2016 8:02 AM EDT

The story of one of the summer’s most anticipated books begins with a trip to Ghana’s Cape Coast Castle–a symbol of slavery, set in stone, and the walls people build to ignore it.

Yaa Gyasi was a college sophomore when she visited her native country in 2009, 18 years after her family had moved to the U.S. She was there to do research for what she thought would be a straightforward novel about a mother and a daughter. When she visited the old fort, that novel shifted and expanded into something much bigger. The result is Homegoing, an account of slavery’s legacy, stretched over eight generations and two continents, and one that earned the 26-year-old a seven-figure advance for her first book.

At the castle in the 1700s, some of the local women married the British soldiers stationed there. Others were kept in dungeons before being shipped off to the New World. On her tour, Gyasi saw those two worlds up close for the first time. “That juxtaposition of the majesty upstairs with the awfulness and despair downstairs really struck me,” she says. “I was really struck also that there were women upstairs who maybe didn’t understand or realize what was going on underneath them.”

This contrast gave Homegoing its premise: the novel begins with Esi and Effia, two half sisters growing up in Fante and Asante territory in the mid–18th century. While one marries a British officer and leads a life of relative privilege at the Cape Coast Castle, the other is captured and sold into slavery. Each subsequent chapter tells the story of one of their descendants, alternating between Ghana and America and showing how the characters were affected by major political events from the 1850 Fugitive Slave Act to the Harlem Renaissance to the heroin epidemic. The book ends around the beginning of the 21st century with Marcus and Marjorie, two students who will never know they’re related. (The Civil War serves as a divider between parts one and two, and is not depicted.)

Certain biographical details of Marjorie’s resemble Gyasi’s own; she says Marjorie’s chapter is the one she revisits the least because it’s so “familiar.”

Once her parents–a professor and a nurse–relocated the family to the U.S., they moved several times before settling in Alabama. “I was a really shy kid,” she says, “and for long periods of my life, the only people I felt really close to or understood by, I guess, were my brothers, who had the same experience not just of moving around but also being a Ghanaian in Alabama, which is a very unique position to be in. We share a lot of trauma and a lot of joy and all the things that all families feel for each other.”

Gyasi says books were her “closest friends” when she was young. “Very quickly for me, reading and writing went hand in hand, though I know that’s not true for all children who are big readers.” She submitted the first story she ever wrote to the Reading Rainbow Young Writers and Illustrators Contest, and received a certificate of achievement signed by actor LeVar Burton.

“It was my most prized possession, and I was just hooked from there,” she says. “But I don’t think I really understood that you could choose writing as a profession for many years later. It wasn’t really until I was 17, when I read Song of Solomon by Toni Morrison and saw, ‘Oh, someone like me, a black woman, can do this as their job and do it so well.’ And so that was really a turning point.”

After graduating from Stanford with a degree in English, Gyasi studied at the Iowa Writers’ Workshop–considered by many to be the best MFA program in the country–and began serious work on Homegoing. When she’d finished, she cold-emailed the draft to an agent whose clients she respected, and he took her on. With its acquisition by Knopf, Gyasi joined the ranks of recent novelists, from Garth Risk Hallberg (last fall’s City on Fire) to Emma Cline (The Girls, also out this summer), who reportedly received more than $1 million for their first book.

Having that paycheck publicized feels like a double-edged sword, Gyasi says. “It’s great that it brings the work attention,” she says, adding that she thinks it’s good for other African immigrants to see that it’s possible to have a lucrative career in the arts. But “it also makes me nervous that people are going to have kind of harsher expectations for my work than they might have otherwise.”

As she started drafting Homegoing in earnest, Gyasi was drawn to Gabriel García Márquez’s One Hundred Years of Solitude. She found the novel’s repetitive and unusual narrative “permissive,” she says. “So many things that writers get told are rules, silly things–‘Don’t start two characters’ names with the same letter’ was something I had heard before. And then you read One Hundred Years of Solitude and they all have the same name.”

Gyasi’s writing shares some of García Márquez’s use of folklore and his narrative rhythm. It also evokes writers like Zora Neale Hurston through its plainspoken language and unusual sentence structure. Sometimes her writing takes the form of parable: “When someone does wrong,” one character says, “whether it is you or me, whether it is mother or father, whether it is the Gold Coast man or the white man, it is like a fisherman casting a net into the water. He keeps only the one or two fish that he needs to feed himself and puts the rest in the water, thinking that their lives will go back to normal. No one forgets that they were once captive, even if they are now free.”

Homegoing earned early praise from Ta-Nehisi Coates, who gave it an endorsement that Gyasi says shocked her. “I didn’t even know that he had a [copy], and my boyfriend turned to me one day and was like, ‘Ta-Nehisi Coates is tweeting about your novel.’ I was like, What? I had been reading his Atlantic pieces since college, and they were really formative for me.” The author Roxane Gay called Homegoing “the strongest case for reparations and black rage I’ve read in a long time.”

Gyasi’s work can be seen as a fictional counterpart to the nonfiction work of Coates and the writers Isabel Wilkerson and Nikole Hannah-Jones, who have explored the lingering effects of slavery and institutionalized racism. “I hope that we can start to have a longer view of our history and how that informs the way that we treat people in the present,” Gyasi says. “Every moment has a precedent and comes from this other moment, that comes from this other moment, that comes from this other moment.”

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