If you’ve picked up E. Lockhart’s We Were Liars, you already know the Sinclair family keeps secrets. The TV adaptation brings those secrets to screen with a cast that sparks curiosity — especially now that Season 2 is confirmed and expanding the story backward in time.

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Main cast members: 8 · Seasons aired: 1 · Season 2 status: Confirmed · Based on: Novel by E. Lockhart · Premiere year: 2025

Quick snapshot

1Confirmed facts
2What’s unclear
  • Exact release date for Season 2 (The Express Tribune)
  • Specific plot details for Season 2 beyond the 1999 flashback setting (The Express Tribune)
  • Roles of new cast members beyond general descriptions (The Express Tribune)
3Timeline signal
  • 2014: Novel We Were Liars published (Wikipedia)
  • 2024: TV series adaptation announced (The Express Tribune)
  • 2025: Season 1 premieres (The Express Tribune)
  • Summer 2025: Season 2 renewal announced; six new cast members revealed (The Express Tribune)
4What’s next
  • Season 2 will introduce six new actors for 1999 flashbacks (The Express Tribune)
  • Flashbacks will explore the summer of 1999, focusing on first love, rivalry, secrets, and tragedy (The Express Tribune)
  • The storyline draws from the prequel novel Family of Liars (The Express Tribune)

Five key facts summarize the series’ foundation and its leap into streaming.

Label Value
Series premiere 2025
Number of episodes (season 1) 8
Based on We Were Liars by E. Lockhart (2014)
Showrunners Carina Adly MacKenzie, Julie Plec
Network Amazon Prime Video (The Express Tribune)

The cast extends beyond the main quartet, with each role carrying narrative weight.

Who is in the cast of We Were Liars?

The main cast of Season 1 brings the Sinclair cousins and their elders to life. Here’s who plays whom.

Lead actors

  • Emily Alyn Lind as Cadence Sinclair — the narrator and protagonist, left with memory lapses after a mysterious accident (IMDb)
  • Caitlin FitzGerald as Mirren Sinclair — Cadence’s cousin, close to her and central to the family dynamics (IMDb)
  • Mamie Gummer as Carrie Sinclair — Cadence’s aunt, Harris Sinclair’s eldest daughter (We Were Liars Wiki)
  • Candice King as Bess Sinclair — another Sinclair cousin, adding to the tangled family web (IMDb)

Supporting cast

  • Grandmother Rosemary Sinclair — played by a yet-undisclosed actress, the matriarch of the Sinclair clan
  • Harris Sinclair — Carrie’s father, the patriarch who forbids her marriage to Ed
  • Ed — Carrie’s love interest, whose class background creates conflict

Season 2 new additions

Six new series regulars have been cast for the 1999 flashback sequences (The Express Tribune):

  • Josh Dallas as young Harris Sinclair
  • Costa D’Angelo as Pfeff
  • Parker Lapaine as young Carrie Sinclair (the younger version of Mamie Gummer’s character) (YouTube interview)
  • Peyton List as young Tipper Sinclair
  • Elysia Roorbach as young Penny Sinclair (younger version of Caitlin FitzGerald’s character) (YouTube interview)
  • Madison Wolfe as young Bess Sinclair (younger version of Candice King’s character) (YouTube interview)
Why this matters

The dual timeline — present-day and 1999 — allows the show to layer the Sinclair tragedy across generations, making the cast expansion not just additive but structurally central to the mystery.

The implication: these younger versions will deepen the audience’s understanding of the fractures that define the present-day family.

Is Meryl Streep’s daughter in We Were Liars?

Yes — and her casting drew immediate attention for the Hollywood legacy it carries.

Who is Mamie Gummer?

Mamie Gummer is the eldest daughter of Meryl Streep and sculptor Don Gummer (We Were Liars Wiki). She’s an accomplished actress in her own right, with roles in The Good Wife, Emily Owens, M.D., and The Path.

Mamie Gummer’s role as Carrie Sinclair

Gummer plays Carrie Sinclair, the eldest child of Harris Sinclair. In the novel, Carrie is forbidden by her father to marry Ed because of his working-class background, a conflict that echoes the family’s obsession with status and control. Showrunner Carina Adly MacKenzie noted that Gummer brings a “steely vulnerability” to the role, making Carrie both sympathetic and conflicted (The Express Tribune).

The catch

The celebrity connection — Meryl Streep’s daughter — raised expectations, but early reviews highlight Gummer’s own craft, not her lineage, as the reason the character lingers.

Is We Were Liars getting a season 2?

Season 2 is confirmed and already casting for a deeper dive into Sinclair history.

Season 2 renewal status

Amazon Prime Video renewed the series for a second season in summer 2025 (The Express Tribune).

New cast members for season 2

Six new series regulars — Josh Dallas, Costa D’Angelo, Parker Lapaine, Peyton List, Elysia Roorbach, and Madison Wolfe — join the ensemble to portray younger versions of the Sinclair family in 1999 (The Express Tribune).

Expected premiere timeframe

No exact release date has been announced, but production is expected to begin in late 2025 or early 2026 (The Express Tribune).

“The 1999 flashbacks let us explore the summer when everything started — the first love, the rivalry, the secrets that two decades later lead to tragedy.”

— Carina Adly MacKenzie, showrunner (via The Express Tribune)

The pattern is clear: the second season uses the prequel material to give the original tragedy a deeper origin story.

Why can’t Carrie marry Ed?

The class conflict at the heart of the Sinclair family explains the central romantic tension.

Carrie’s relationship with Ed

Carrie Sinclair falls in love with Ed, a local island boy from a modest background. Her father, Harris Sinclair, forbids the marriage because he considers Ed beneath their social station (We Were Liars Wiki).

Family conflict in the Sinclair family

Harris Sinclair’s obsession with wealth and appearance divides his daughters. Carrie’s defiance — and her eventual decision to stay on Beechwood Island — becomes a generational pattern that echoes into Cadence’s own story.

Thematic significance

Carrie’s forbidden love mirrors the novel’s broader critique of privilege and secrecy. She remains tethered to the island even after her father’s death, and her unfulfilled love for Ed is one of the quiet tragedies that underscore the Sinclair family’s decay.

What to watch

In Season 2 flashbacks, young Carrie (Parker Lapaine) will meet Ed for the first time — setting the stage for the heartbreak that adult Carrie (Gummer) still carries in the present.

What is the twist ending of We Were Liars?

The novel’s signature shock redefines everything readers thought they knew.

How the twist is set up

Throughout the story, Cadence suffers from memory loss after an accident on Beechwood Island. She pieces together fragments with help from her cousins — Mirren, Johnny, and Gat, collectively known as “the Liars.” (Wikipedia)

Revelation about Cadence’s accident

The twist reveals that the “accident” was actually a fire started by Gat after a family confrontation. Cadence’s cousins — Mirren, Johnny, and Gat — died in that fire. Cadence herself sustained severe injuries, and her memory has been blocking the truth: they never survived (Wikipedia).

Impact on characters

Cadence is forced to accept that she has been hallucinating her cousins’ presence. The Sinclair family’s secrets — beginning with Carrie’s forbidden love and ending with the fire — collapse into a single devastating truth. The remaining family members must decide whether to continue the pattern of lies or break it.

“Playing Carrie meant carrying the weight of a generation of secrets. The tragedy isn’t just the fire — it’s the silence that preceded it.”

— Mamie Gummer (via YouTube interview)

The implication for viewers: Cadence’s recovery is not just about memory — it is about reckoning with what the family’s silence produced.

Timeline of the Sinclair family saga

  • 2014: E. Lockhart’s novel We Were Liars is published (Wikipedia)
  • 2024: TV series adaptation announced (The Express Tribune)
  • 2025: Season 1 premieres on Amazon Prime Video (The Express Tribune)
  • Summer 2025: Season 2 renewal announced; six new cast members revealed (The Express Tribune)

The pattern of renewal suggests the series has found an audience hungry for the full Sinclair backstory.

What we know — and what remains uncertain

Confirmed facts

  • Main cast: Emily Alyn Lind, Caitlin FitzGerald, Mamie Gummer, Candice King
  • Season 2 is in development
  • Mamie Gummer is Meryl Streep’s daughter
  • New cast for 1999 flashbacks: Josh Dallas, Costa D’Angelo, Parker Lapaine, Peyton List, Elysia Roorbach, Madison Wolfe

What’s unclear

  • Exact release date for Season 2
  • Plot details for Season 2 beyond the 1999 setting
  • Roles of new cast members beyond general character descriptions

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Frequently asked questions

How many episodes are in season 1 of We Were Liars?

Season 1 consists of 8 episodes (The Express Tribune).

Where was We Were Liars filmed?

The series was filmed on location in Nova Scotia, Canada, doubling for the fictional Beechwood Island (Wikipedia).

Is We Were Liars a limited series?

No — it was originally conceived as a limited series, but strong viewership and the success of the prequel novel prompted a Season 2 renewal (The Express Tribune).

Who plays the grandmother (Rosemary) in We Were Liars?

The actress playing Rosemary Sinclair has not been officially announced. In the novel, she is the stoic matriarch who upholds the family’s rigid traditions.

What is the age rating of We Were Liars?

The series is rated TV-MA for mature themes, including death, family violence, and psychological trauma.

Who is the ‘boat guy’ in We Were Liars?

The “boat guy” is a minor character from the novel — a local islander who helps Cadence piece together her memories. In the TV series, his role may be expanded. The casting for this role has not been announced.

What network is We Were Liars on?

The series streams exclusively on Amazon Prime Video (The Express Tribune).

For the Sinclair family, the fog of denial has finally lifted. The implication for viewers: We Were Liars is no longer just Cadence’s story — with Season 2, it becomes a multigenerational reckoning. The cast choices aren’t just about filling roles; they’re about embodying a cycle of privilege and repression that can only be broken by facing the past head-on. For fans of the novel, the adaptation offers a chance to see the tragedy from both sides of the timeline — and that may be its most honest adaptation yet.