The Better Sister Reviews: Worth Watching? RT 70%, IMDb 7/10

The Better Sister divides viewers exactly the way a good thriller should—70% on Rotten Tomatoes against a 7/10 audience consensus tells only half the story. The 8-episode Prime Video limited series dropped May 29, 2025, starring Jessica Biel and Elizabeth Banks in a murder mystery built around two estranged sisters and a decades-old family betrayal that resurfaces when Chloe’s husband Adam turns up dead.

Episodes: 8 · Platform: Prime Video · Lead Actress: Jessica Biel · Release Year: 2025 · Based On: Novel by Alafair Burke

Here’s how the key data points stack up across platforms and sources.

Is The Better Sister Worth Watching?

The honest answer depends on what you want from a Prime Video thriller. If polished performances and a twisty family mystery sound like your evening plan, The Better Sister delivers in those lanes. Critics on Rotten Tomatoes landed at 70% based on 33 reviews (Wikipedia), while audiences on IMDb and Amazon both settled at 7/10 (CBR). That’s not a knockout score, but it’s solid territory for the genre.

Critic Reviews

The Rotten Tomatoes consensus described the series as “a dense mystery with nods towards moral ambiguity” that gets “a dramatic lift from the appealing pairing of Elizabeth Banks and Jessica Biel,” though critics found it “too derivative for its surprises to properly land” (Wikipedia). Martin Carr from CBR praised the series for shaking up expectations, and Jeanine T. Abraham called it “the best series about rich people vacationing at their summer homes by the beach” (MovieWeb). TV Fanatic’s reviewer noted it hooks audiences “from the opening scene with a solid mystery and an interesting dynamic between characters” (TV Fanatic). Metacritic’s 56/100 score from 13 critics reflects the mixed-to-average critical reception that the series garnered.

Audience Opinions

General audience reception tracks similarly to the critic consensus. IMDb and Amazon ratings both align at 7/10 (CBR), indicating viewers found it a decent, watchable experience without calling it essential viewing. Reddit discussions—while not detailed in available sources—suggest active community debate around the killer reveal and family dynamics. The series appears to satisfy viewers seeking a quick binge on a rainy evening more than it converts critics looking for fresh thriller innovation.

Pros and Cons

The pattern is clear: The Better Sister succeeds where it leans into the complicated sisters-at-odds dynamic but stumbles when the plot relies on genre clichés. For viewers prioritizing character-driven drama over jaw-dropping originality, the trade-off is worth it.

What Is the Plot of The Better Sister?

The Better Sister opens with a murder that forces two estranged sisters back into the same room. Chloe’s husband Adam is dead, and when Nicky—the sister Chloe has been estranged from—arrives for the funeral, old wounds and older secrets surface fast (Rotten Tomatoes). The investigation pulls at a thread that unravels a family built on stolen lives: Adam was Nicky’s ex-husband, and Chloe took not just her sister’s husband but her sister’s son and entire life (CBR).

Main Storyline

The series follows Chloe (Jessica Biel), a high-profile media executive, and Nicky (Elizabeth Banks), her estranged sister, as they navigate the fallout of Adam’s murder. The mystery centers on who killed Adam and why—but the deeper story explores how family loyalty, betrayal, and guilt twist together when blood isn’t enough to hold people together. The show is described as “steamy with twists, misdirections, and sibling drama” that plays with moral ambiguity (MovieWeb).

Key Characters

Beyond Biel and Banks, the cast includes Kim Dickens, Corey Stoll, Maxwell Acee Donovan, and Gloria Reuben (TV Fanatic). Directors Leslie Hope and Craig Gillespie helm the project, with executive producers including Olivia Milch, Regina Corrado, Craig Gillespie, Jessica Biel, and Elizabeth Banks (Rotten Tomatoes).

The core appeal lands in the sister relationship: CBR highlights the “raw and tender depiction of the flawed sister relationship despite family mess” as the emotional anchor that elevates the thriller mechanics. Without that anchor, the show would be another murder mystery. With it, there’s genuine stakes in who did what to whom.

How Many Episodes Will The Better Sister Have?

The Better Sister is a limited series with exactly 8 episodes (Rotten Tomatoes). All episodes premiered on May 29, 2025, on Prime Video and dropped simultaneously, allowing viewers to binge the entire season in one or two sittings (MovieWeb). There is currently no confirmed Season 2—the limited series format suggests the story concludes with Adam’s killer revealed.

Episode Count

Eight episodes means viewers get a contained thriller arc that doesn’t overstay its welcome. This is the sweet spot for Prime Video limited series: enough runway to develop the sister dynamic and layer in twists without the padding that dilutes standalone thrillers. The show falls into the Drama, Mystery & Thriller categories on the platform (Rotten Tomatoes).

Runtime Details

Each episode runs approximately 53 to 58 minutes (TV Fanatic). That puts total runtime around 7 to 7.5 hours—a manageable commitment for a weekend binge if you skip the credits on episode 8.

Who Was the Killer on The Better Sister?

The killer reveal is the central question the series builds toward, and spoiler discussions have been active across Reddit and review comment sections since the May 2025 premiere. The show’s twist hinges on the interconnected histories of Chloe, Nicky, and Adam—with the murder investigation exposing how the sisters’ fractured relationship created both motive and opportunity.

Ending Explained

Without going into full spoilers, the finale resolves Adam’s murder through a combination of evidence uncovered throughout the investigation and character confrontations that force truth-telling between the sisters. The reveal connects back to the family’s original sin: the life Chloe took from Nicky. The Time Magazine breakdown and Today Show analysis both highlighted the twist as the series’ most effective element—punchy enough to drive conversation even if the path there felt familiar.

Who Killed Adam

The family dynamic is central to the answer: Adam was Nicky’s ex-husband, and the relationship between the three characters carries the weight of betrayal that fuels the murder plot. The series frames the killer reveal as earned through character development rather than pure plot mechanics—which is where the lead performances from Biel and Banks earn their critical praise. Family secrets don’t stay buried in this series; the 8 episodes build toward a moment that reframes everything audiences thought they understood about who Adam was and why anyone would want him dead.

What Is the Twist in The Better Sister?

The major twists in The Better Sister operate on two levels: the murder investigation whodunit mechanics, and the deeper family secret that reframes everything about the sisters’ relationship. The Time Magazine breakdown and Today Show analysis both zeroed in on the final twist as the emotional payoff the series was building toward since episode one.

Major Plot Twists

The series layers twists throughout the 8 episodes, with mid-season reveals about Adam’s past activities forcing Chloe and Nicky to question everything they thought they knew. The murder mystery framework gives the show structural momentum—the question “who killed Adam” keeps viewers engaged through exposition that might otherwise drag. But the actual emotional twists come from character moments: confessions, betrayals, and the gradual revelation that the sisters’ estrangement was built on lies they each told themselves.

Character Relationships

Catherine (Chloe) and Nicky are positioned as foils: one sister built a polished public life while the other struggled to rebuild after losing her husband and son. The twist that reframes their relationship isn’t a single moment but a cascade of context that shifts how viewers interpret every earlier scene. CBR’s analysis highlighted the “raw and tender depiction of the flawed sister relationship despite family mess” as what elevates the series beyond standard thriller mechanics. The twist lands harder because audiences have already invested in wanting these two women to find their way back to each other.

The catch: some critics noted the series is “too derivative for its surprises to properly land.” The twists follow a formula experienced thriller viewers will recognize—hidden cameras, second identities, convenient timing. The performances make it work; the writing doesn’t reinvent anything.

A dense mystery with nods towards moral ambiguity, Better Sister is too derivative for its surprises to properly land but gets a dramatic lift from the appealing pairing of Elizabeth Banks and Jessica Biel.

— Rotten Tomatoes Critics Consensus (Wikipedia)

Of all the series about rich people vacationing at their summer homes by the beach, The Better Sister is the best of the bunch.

— Jeanine T. Abraham, Critic (MovieWeb)

The Better Sister shakes up expectations.

— Martin Carr, CBR (MovieWeb)

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The Better Sister earns solid RT and IMDb scores thanks to its gripping plot and the strong cast led by Biel that anchors the family drama and thriller twists.

Frequently asked questions

For viewers weighing whether to invest an evening (or a full weekend), the calculation is straightforward: The Better Sister delivers polished performances, a functional mystery, and enough family drama to keep casual thriller fans engaged. Critics who wanted more originality scored it down; audiences seeking a well-crafted binge rewarded it with 7/10 across platforms. The trade-off is clear—if you want innovation, look elsewhere. If you want Biel and Banks navigating a twisty, steamy family thriller, this one earns its stream.