Four Siblings Reunite After Scandalous Family Affair

Cynthia D'Aprix Sweeney's novel 'Lake Effect' explores the aftermath of a 1970s elopement that rocked a small community.

Published on Mar. 4, 2026

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Cynthia D'Aprix Sweeney's new novel 'Lake Effect' follows the story of two families - the Larkins and the Finnegans - whose lives become intertwined after the married mother of the Larkin siblings, Nina, has an affair with the father of the Finnegan siblings, Finn, leading to their elopement. The novel explores the fallout of this scandal on the four teenage siblings - Clara and Bridie Larkin, and Dune and Fern Finnegan - as they navigate the changing family dynamics and their own relationships in the 1970s and 1990s.

Why it matters

The novel is the latest in a growing subgenre of contemporary fiction featuring stories about 'four adult siblings reconvening to rehash their privileged but fraught adolescence.' These types of family dramas tap into readers' fascination with the complex dynamics and lingering effects of dysfunctional upbringings, while also reflecting broader societal trends like the popularity of multiple narrators and the desire for juicy, character-driven sagas.

The details

In 'Lake Effect,' the two families are initially just neighbors in an upper-middle-class Rochester, New York community in 1977 until Nina and Finn's affair leads to their elopement, rocking the small, uptight Catholic town. The novel follows the fallout and aftermath of this scandal, exploring the perspectives of all four teenage siblings as they navigate the changing family dynamics and their own relationships into adulthood in the 1990s.

  • The novel is set primarily in 1977 and the 1990s.
  • The initial elopement scandal occurs in 1977.

The players

Clara Larkin

One of the Larkin siblings, whose teenage romance with Dune Finnegan ends after the elopement scandal.

Bridie Larkin

One of the Larkin siblings, who later falls in love with her stepbrother Dune as an adult.

Dune Finnegan

One of the Finnegan siblings, whose teenage romance with Clara Larkin ends after the elopement scandal.

Finn Finnegan

The father of the Finnegan siblings, who has an affair with and elopes with the Larkins' mother, Nina.

Nina Larkin

The mother of the Larkin siblings, who has an affair with and elopes with Finn Finnegan, the father of the Finnegan siblings.

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What they’re saying

“She enjoyed performing deception now that they were safely husband and wife.”

— Nina Larkin (The New York Times)

“Maybe the only easy thing in her life.”

— Bridie Larkin (The New York Times)

What’s next

The novel follows the Larkin and Finnegan families into the 1990s, with a scandalous wedding, a birth, and a death still to come.

The takeaway

Cynthia D'Aprix Sweeney's 'Lake Effect' is the latest entry in a growing subgenre of contemporary fiction exploring the complex family dynamics and lingering effects of privileged but dysfunctional upbringings, tapping into readers' fascination with juicy family sagas.