Title: The Foursome
Author: Christina Baker Kline
Publisher: Mariner Books
Publication date: May 12, 2026
Length: 384 pages
Genre: Historical fiction
Source: Review copy courtesy of the publisher via NetGalley
Rating:

From #1 New York Times bestselling author Christina Baker Kline comes a boldly original reimagining of an astonishing true story of two sisters in nineteenth-century North Carolina—Kline’s own distant relatives—who married world-famous conjoined twins from Siam.

When Chang and Eng Bunker arrive in Wilkes County in 1839, they’re not just a curiosity—they’re a sensation. Everyone is eager to learn whether the salacious rumors about them are true. Within months, the twins have opened a general store, bought land, and begun building a plantation. Now, word has it, they’re looking for wives—and in a place that thrives on gossip and legacy, their ambitions set the community on edge.

Sarah and Adelaide Yates, daughters of a once-prominent local family brought low by scandal, are drawn into their orbit. Bold, beautiful Addie sees in the twins’ fame a chance to reclaim her future. Sallie, quiet and observant, isn’t so sure. When the twins’ lives become entangled with theirs, they must navigate loyalty, longing, and identity in a world where everything—including race, class, and gender—is rigidly defined.

Spanning five decades and unfolding against the backdrop of a fractured nation hurtling toward war, The Foursome is both intimate and a story of love and constraint, identity and reinvention. With piercing insight and emotional precision, Kline brings to life a forgotten chapter of American history and the complex, boundary-defying marriages at its center.

In this fascinating work of historical fiction, author Christina Baker Kline shines a spotlight on the conjoined twins for whom the term “Siamese twins” was coined, by showing their lives through the eyes of one of the sisters who married them.

Most of us take for granted that, at the very least, we come into this world alone and die our own deaths But this was not true for my husband and his brother. They could not escape each other.

The Foursome is narrated by Sarah “Sallie” Yates, a young woman with a damaged reputation as the novel opens in the 1840s. After a family scandal, she and her younger sister Adelaide face limited prospects. When the famous conjoined twins Chang and Eng Bunker (the “Siamese Double Boys”) settle in their North Carolina community, the sisters are as curious as everyone else, but when curiosity turns to courtship, it’s Addie who leads the way, seeing the twins as a way out of their difficulties and a route to a secure future.

The engagement and marriage is, of couse, scandalous. Chang and Eng are joined by a band of flesh at the base of their chests. They’re active, healthy, educated men who pride themselves on living as gentlemen, but to the people of North Carolina, they’re seen as foreigners and as freaks. When the brothers marry the Yates sisters, the gossip is intense and personal.

As Sallie shares with readers, navigating a marriage to a man who can never leave his brother’s side presents complex challenges, from the embarrassment of figuring out sleeping (and sexual) arrangements to sharing a household with her sister to never once being able to have a truly private conversation with her husband. Sallie’s marriage to Eng does eventually turn into one of love and compatibility, but the unavoidable presence of Addie and Chang is a constant source of tension.

Still, something must work. Between them, the two couples have a total of twenty-one children over the years! The sisters eventually demand separate homes, but even so, the rigid scheduling and presence of a husband’s brother mean that the families can never truly be separate.

I saw how they leaned on each other — how their bond became a kind of fortress, both shelter and prison. How, sometimes, it shut out even those who loved them.

Beyond the domestic, The Foursome explores the lives of the Bunker husbands and wives in the context of the looming Civil War. Chang and Eng are landowners — and in the North Carolina of the 1800s, that means that they’ve slave owners. Sallie accepts that enslaved workers are simply a fact of life, but over time, her eyes are opened to what this actually means for the people who raise her children and care for her needs. As their community is drawn into war, and as sons of both households go off to fight, Sallie increasingly finds herself at odds with Addie and their husbands about the Confederacy’s ideals and what it is that they’re fighting to preserve.

Sallie’s voice in The Foursome is open and revealing. She shares the joyful moments, especially as she gives birth to child after child, as well as the discomfort of being married to a man who’ll always belong more to someone else. The descriptions of the family’s adaptation to the brothers’ conjoined nature offer a fascinating look into a situation that seems practically beyond belief.

I did wish that Sallie’s awakening to the evils of slavery came sooner. I couldn’t help but feel that some of her change in perspective was driven by the purely personal, in terms of how slavery affected her rather than out of a sense of compassion and justice for the enslaved. She can’t make up for the past, but she eventually attempts her own version of reparation by offering new beginnings and opportunities to those she’d wronged.

There are sins of action and sins of inaction. I cannot forgive myself for the times I saw wrong and turned away.

Because the story is told through Sallie’s point of view, we only understand Addie through her eyes. This is understandable, yet sometimes frustrating. Addie is the catalyst for the marriage — I would have liked a deeper understanding of Addie’s inner life and why she felt so strongly that the choice to marry the brothers was their best (and only) option.

The Foursome is actually the second novel I’ve read about these historical figures. Chang and Eng by Darin Strauss, published in 2000, is a fictionalized account of their lives as told by Eng. I don’t remember a lot of the details at this point, but I do remember how interesting I found it. Reading The Foursome, I was reminded of many of the biographical details, and was entirely drawn in by this new approach and perspective on their lives.

The Foursome is a powerful, compelling read about remarkable lives, set against the backdrop of one of the most devastating and consequential periods in American history. Sallie’s voice is memorable, and the experiences she describes paint a picture of a particular family’s life that might seem unbelievable if it weren’t actually based on historical events. Highly recommended.

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