In 1843, two sisters from a North Carolina farming family climbed into bed with their husbands, the most famous men in America: the original “Siamese twins,” Chang and Eng Bunker, who were joined at the chest by a band of cartilage. They lived this way for more than three decades. Between them, they had twenty-one children. Christina Baker Kline, who happens to be a distant relative of those sisters, has spent years trying to imagine what such a marriage might have actually felt like. The result is The Foursome by Christina Baker Kline, a novel that resists almost every easy framing the premise invites.

What the Novel Is About (Without the Spoilers)

Sarah and Adelaide Yates are daughters of a once-prominent Wilkes County family whose social standing has been bruised by an unnamed scandal. When Chang and Eng arrive in town with their wealth, their international fame, and their unmistakable presence, the gossip is immediate. The bold elder sister Addie sees a chance to reclaim her future; the quieter Sallie, who narrates the book, hesitates, observes, and ultimately follows. From the wedding through the Civil War and into widowhood, the foursome shares houses, a bed, children, money, and a life nobody around them quite knows what to do with.

If you arrive expecting carnival sensationalism, look elsewhere. Kline is interested in the long marriage, not the spectacle.

Why Sallie Is the Right Narrator

Kline’s choice to filter the story through Sallie is the smartest call she makes. Addie is too sure of herself to be a complicated narrator. Chang and Eng have already been written about for almost two centuries. Sallie, who in real life was buried in an unmarked grave away from the family plot, is a near-blank in the historical record. Kline fills that absence with a quiet, watchful, self-questioning voice. Sallie sees what others choose not to see. She helps Grace, the enslaved woman in her household, with small chores not because she is a heroine but because it eases her own conscience, and Kline never lets her off the hook for that distinction.

The novel earns its strongest passages when Sallie sits with her own complicity. That honesty is what makes the book more than a curiosity piece.

The Writing

Kline writes with a clean, controlled lyricism that suits both the period and the temperament of her narrator. Sentences are unfussy. Metaphors are carefully rationed. A few set pieces stay with you long after the book is closed:

• The wedding-night scene, written without exploitation, with a strange tenderness around the impossibility of privacy in such close quarters.
• The slow domestic dread of the Civil War years, when sugar disappears, then salt, then almost everything else, and Sallie and Grace cook side by side because they have no other choice.
• The Leah-at-the-well embroidery Sallie picks up and puts down across the years, watching what she stitches become something other than what she started.

You can feel the author pulling back from melodrama on almost every page. That restraint is also, occasionally, the book’s limitation.

Where The Foursome by Christina Baker Kline Wobbles

Read against its reception, you can see why most readers settle around four stars rather than five. A few smaller issues add up.

1. The middle softens. The years between the early marriage and the war stretch out. Domestic detail piles up, sometimes in ways that feel more researched than alive.
2. Addie is held at arm’s length. Sallie’s narration is bounded by design, which means we get Addie as Sallie reads her, and Sallie often reads her ungenerously. A reader can sense the missing book where Addie would speak for herself.
3. The moral reckoning is uneven. Kline is clear-eyed about slavery, and Grace is one of the more carefully drawn enslaved characters in recent historical fiction by a white novelist. But the brothers’ slaveholding, and the suggestion that Eng may have fathered children with an enslaved woman, sit in the book with a weight the structure does not always fully absorb.
4. A few period beats land flat. The dinner-table conversations about Lincoln and secession feel a little rehearsed, the dialogue closer to documentary voice-over than living talk.

None of this sinks the book. It does mean a strong novel occasionally settles for being a sturdy one.

What the Book Gets Right

That said, the things this book gets right are not small things.

• Sisterhood without sentimentality. Sallie and Addie compete, wound each other, separate, reconcile, and keep failing to become the kind of close their shared circumstance would suggest.
• Marriage as an enclosure. The constant, structural lack of privacy in a four-person marriage becomes a quiet horror more affecting than any plot turn.
• A grown woman’s slow change of mind. Sallie does not have a revelation. She has years of small, accumulating disturbances of conscience, the most honest portrait of late-blooming moral awakening I have read in a while.
• A historical curiosity treated as a marriage. Chang and Eng are not freaks here. They are not saints either. They are difficult, charming, ambitious, sometimes cruel men, and the book never asks us to pity or romanticize them.

How It Fits in Kline’s Body of Work

Readers who came to Kline through Orphan Train will recognize her care for women whose lives slipped between the cracks of official record. Those who loved A Piece of the World, her novel about Andrew Wyeth’s Christina, will recognize the close-grained interior portraiture. The Exiles, her novel about three women shipped to a Tasmanian convict colony, shares this book’s interest in female friendship under impossible constraint. Sweet Water, Bird in Hand, Desire Lines, and The Way Life Should Be round out a body of work consistently drawn to the inner lives of ordinary women in difficult arrangements. Set against those earlier books, The Foursome by Christina Baker Kline is broader in scope and more historically dense, sometimes to its benefit and sometimes at the cost of the intimacy she does best.

If You Liked This, Read These Next

For readers who finish The Foursome by Christina Baker Kline and want a similar reading experience:

1. Chang and Eng by Darin Strauss, the same real-life subjects told from the brothers’ shared perspective.
2. The Invention of Wings by Sue Monk Kidd, for Southern sisters, slavery, and a slow-burning moral awakening.
3. Hamnet by Maggie O’Farrell, historical fiction that fills in the silent woman beside a famous man.
4. The Personal Librarian by Marie Benedict and Victoria Christopher Murray, another novel about a woman whose public and private selves never quite line up.
5. The Personal History of Rachel DuPree by Ann Weisgarber, a quiet, marriage-centered period novel of the American interior.
6. Inseparable: The Original Siamese Twins and Their Rendezvous with American History by Yunte Huang, the nonfiction account Kline herself drew from.

Final Word

The Foursome by Christina Baker Kline is a careful, intelligent, sometimes beautiful novel that takes a story most readers would expect to be sensationalized and treats it with adult seriousness. It is also a touch long, occasionally too neat in its moral framing, and held back slightly by its narrator’s habitual reserve. What it gives you, more than plot, is the texture of a marriage no one was ready for and a woman quietly becoming herself inside it. For readers who prefer historical fiction that values steadiness over surprise, this is well worth your time.