The Sinclairs Of Beechwood: Meet The Full Cast Of Prime Video's 'We Were Liars' TV Series And Their Characters

The highly anticipated television adaptation of E. Lockhart's bestselling novel, We Were Liars, has finally arrived on Prime Video, and with it comes a cast tasked with bringing the complex, wealthy, and deeply secretive Sinclair family to life. The series, which premiered on June 18, 2025, is a psychological thriller that unravels the mystery of "Summer Seventeen" on the exclusive Beechwood Island, focusing on the four cousins—known collectively as "The Liars"—and the family patriarch, Harris Sinclair. This article breaks down the full ensemble, from the main four Liars to the powerful Sinclair mothers, giving you the definitive guide to the actors behind the summer's most twisted family drama.

As of today, December 10, 2025, the buzz around the show's dark secrets, stunning visuals, and the chemistry of its young lead actors is at an all-time high, making this guide to the We Were Liars cast the most current and essential resource for fans. The series, developed by Julie Plec and Carina Adly MacKenzie, delves into the themes of inherited wealth, memory loss, and the devastating consequences of a single, fateful summer, promising to be a faithful yet fresh take on the source material.

The Liars: Full Cast Profiles and Character Breakdown

At the heart of the We Were Liars mystery are the four cousins, the eldest generation of the Sinclair grandchildren who spend every summer on Beechwood Island. Their bond is intense, their secrets are deep, and their lives are irrevocably changed by the events of the summer Cadence calls "Summer Seventeen."

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1. Emily Alyn Lind as Cadence "Cady" Sinclair Eastman

• Character Role: The narrator and protagonist of the story. Cadence is the eldest Sinclair grandchild and the daughter of Penny Sinclair. She suffers from severe migraines and amnesia following a mysterious accident during Summer Seventeen, spending the series attempting to piece together the lost memories of what truly happened on Beechwood Island.
• Actor Bio: Emily Alyn Lind is a seasoned young actress known for her roles in the HBO Max series Gossip Girl (2021 reboot) as Audrey Hope, and the horror film Doctor Sleep. Her experience playing complex, privileged characters makes her a perfect fit to portray the fragile yet determined Cadence.

2. Shubham Maheshwari as Gat Patil

• Character Role: Gat is the only non-Sinclair Liar, a friend of Johnny and the nephew of Bess's long-time boyfriend, Ed. He is an outsider who brings a critical, intellectual perspective to the Sinclairs' sheltered world of inherited wealth, and he is Cadence's primary love interest.
• Actor Bio: Shubham Maheshwari is a rising star, bringing depth to the role of Gat, a character pivotal to challenging the Sinclair family's status quo. His casting was met with enthusiasm from book fans who appreciated the accurate portrayal of Gat's character from the novel.

3. Esther McGregor as Mirren Sinclair Sheffield

• Character Role: Mirren is one of the four Liars and the daughter of Bess Sinclair. She is fiercely loyal to her cousins and often acts as the peacekeeper or the voice of reason among The Liars. Her character embodies the classic, preppy Sinclair aesthetic.
• Actor Bio: Esther McGregor is an actress and model, and the daughter of actor Ewan McGregor. Her role as Mirren marks one of her most significant acting credits, making her performance a highly anticipated element of the series.

4. Joseph Zada as Johnny Sinclair Dennis

• Character Role: Johnny is the fourth of The Liars, the son of Carrie Sinclair, and the closest cousin to Cadence. He is known for his playful, energetic, and sometimes reckless demeanor, often acting as the ringleader for the group's adventures.
• Actor Bio: Joseph Zada has appeared in various TV and film projects, and his portrayal of Johnny Sinclair Dennis is a key role in the ensemble, capturing the spirit and tension within the central group.

The Adults: The Sinclair Mothers and the Patriarch

The mystery of We Were Liars is deeply rooted in the generational dynamics of the Sinclair family, particularly the intense, competitive relationship between the three sisters—the daughters of the patriarch, Harris Sinclair. These women, often referred to as "The Aunts" in the book, are central to the family's drama and the secrets that underpin the entire plot.

The Competitive Sinclair Sisters (The Mothers)

• Caitlin FitzGerald as Penny Sinclair: Penny is Cadence's mother and the sister known for her artistic temperament and anxiety. Her relationship with her father, Harris, is complicated by her dependence on his wealth and her desire for his approval, which is a major source of tension in the series. FitzGerald is widely recognized for her roles in Masters of Sex and Succession, bringing a strong dramatic pedigree to the role of Penny.
• Mamie Gummer as Carrie Sinclair: Carrie is Johnny's mother and the most outspoken and often volatile of the three sisters. She is portrayed as having a sharp wit and a deep-seated rivalry with her siblings, especially concerning their inheritance and standing in the family. Gummer, the daughter of Meryl Streep, is known for her roles in The Good Wife and True Detective, and she brings a powerful presence to the competitive Carrie.
• Candice King as Bess Sinclair: Bess is Mirren's mother and the sister who often tries to maintain a sense of normalcy and traditional family values, despite the chaos and secrets swirling around the Sinclairs. King is most famous for her long-running role as Caroline Forbes in The Vampire Diaries, and her casting was a significant draw for fans of young adult television.

David Morse as Harris Sinclair

David Morse plays Harris Sinclair, the wealthy, formidable patriarch of the Sinclair family and the owner of Beechwood Island. Harris's influence and control over his daughters and grandchildren are the primary drivers of the family's dysfunction and the source of their deep-rooted secrets. Morse is a veteran actor with an extensive career, including roles in The Green Mile and House M.D., ensuring the character of the powerful, demanding grandfather is in capable hands.

Topical Authority and Key Entities in the Series

To fully appreciate the depth of the We Were Liars adaptation, it's important to recognize the numerous entities and themes that contribute to its topical authority as a psychological mystery. The series is not just about a group of cousins; it is a deep dive into the corrosive nature of extreme wealth and the facade of the perfect family.

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The show’s creative team is led by co-creators and executive producers Julie Plec and Carina Adly MacKenzie, both known for their work on hit supernatural dramas like The Vampire Diaries and Roswell, New Mexico. Their involvement signals a focus on intense character drama and high-stakes mystery, appealing to a broad young adult audience. Author E. Lockhart is also an executive producer, ensuring the adaptation remains true to the book's core themes and the shocking twist ending.

The setting itself is a major entity: Beechwood Island, the private island off the coast of Massachusetts, where the Sinclairs' four grand houses—Windemere, Red Gate, Cuddledown, and Clairmont—serve as physical representations of the family's different branches and their isolation from the outside world. The concept of Summer Seventeen is the central plot device, referencing the summer Cadence suffers her debilitating injury and memory loss, which the series meticulously reconstructs.

Other key entities and themes that drive the narrative include:

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• The Sinclair Dynasty: The family's vast, inherited wealth and the pressure to maintain the image of perfection.
• The Fire: The catastrophic event that ties all the Liars and the family's secrets together.
• Gatwick "Gat" Matthew Patil: His outsider status and role as a catalyst for change within the insular family unit.
• Penny Sinclair Eastman: Cadence's mother, whose emotional instability adds to the family's dysfunction.
• Tipper Sinclair: Harris's deceased wife, whose absence and legacy still loom large over the family.
• The Mystery Ending: The book's famous, heartbreaking twist that the series must now deliver to a new audience.
• Psychological Thriller Genre: The show's classification, which emphasizes Cadence's unreliable narration and fragmented memory.
• Prime Video Streaming: The platform bringing the adaptation to a global audience.

With a confirmed cast of talented actors like Emily Alyn Lind, Mamie Gummer, and David Morse, the Prime Video adaptation of We Were Liars is positioned to be a definitive psychological drama for the streaming era. The ensemble cast beautifully embodies the complex, flawed, and ultimately tragic Sinclair family, ensuring that the secrets of Beechwood Island will captivate both long-time fans of E. Lockhart's novel and newcomers to the twisted mystery. The series promises to be a haunting exploration of family, grief, and the lies we tell ourselves to cope with the truth.