WRIGHT THOMPSON: His book documents how thoroughly this country was built on a belief that some people were worthless and expendable because of the color of their skin. PHOTO COURTESY OF INSTAGRAM.COM/WRIGHTTHOMPSONBOOKS

“The barn … is long and narrow with sliding doors in the middle,” writes Wright Thompson in ‘The Barn: The Secret History of a Murder in Mississippi.’ “Nobody knows when it was built exactly but its cypress-board walls were already weathered in the summer of 1955.”

What happened inside the barn on Aug. 28, 1955, changed history. It’s where a 14-year-old boy was tortured and pistol-whipped for allegedly whistling at a white woman. He was then driven to the nearby Tallahatchie River, where he was shot in the head and a cotton gin fan was tied around his neck with barbed wire to sink the body.

The boy, Emmett Till, was laid to rest in an open casket at his mother’s request, his mutilated face visible to more than 100,000 mourners who paid their respects in Chicago. The image was widely shared in Jet magazine, but withheld from the public by mainstream media outlets. It’s an image that Rosa Parks said years later was on her mind when she refused to give up her seat on an Alabama bus.

Thompson travels back to his native Mississippi (he grew up in Clarksdale, about 30 miles north of Drew, the closest town to the barn) and talks to scores of people, building on the reporting of others to tell Till’s story, and using the barn as a jumping off point to explore the racist history of the Mississippi Delta.

He traces the barn’s land – legally identified on maps as Section 2, Township 22 North, Range 4 West – from the Native Americans who were driven off it, to the British and American industrialists whose fortunes rose and fell with the price of cotton, to the sharecropping life that impoverished generations of Black farmers.

Throughout, he pauses to consider his personal history and the collective effort required to cover up details of Till’s story in this country’s stubborn refusal to confront its racist origins.

It’s powerful and unflinching writing. Till’s case, while now famous, was not original. White Mississippians killed Blacks indiscriminately and without consequence for decades. The desegregation of schools ordered by the Supreme Court in Brown v. Board of Education in 1954 was mostly ignored, and at least in part helped set in motion Till’s killing and the subsequent acquittal of the murderers by a jury of white men.

All five candidates for governor that year, writes Thompson, promised to “take any measure to stop the most dangerous and immediate threat to the Mississippi way of life: a Black child who wanted to learn math.”

Thompson does a deep dive into every facet of the story, introducing characters at such a rapid pace that it’s often hard to remember who’s who. There’s a helpful family tree at the beginning that readers will turn back to many times. What’s unforgettable by the end of Thompson’s book, though, is just how thoroughly this country was built on a belief that some people were worthless and expendable because of the color of their skin.

There’s a scene early in “The Barn” when Thompson meets with Gloria Dickerson, a Black woman who grew up in the Delta, left and built a career, but returned in retirement to run a nonprofit that teaches Delta children their true history. Her charge to those kids is simple. “Remember and do better,” she says. “Remember and make it better.” It’s the work of activists like Dickerson and books like “The Barn” that offer some hope that America can heal its oldest and deepest wound.