Peacock’s Most-Watched Series Ever Is A Perfect 10/10 Psychological Thriller

While All Her Fault became Peacock’s biggest success ever shortly after the psychological thriller adaptation arrived on the streaming service, it is easy to see how the show reached this impressive position. Across the many streaming services that are available to viewers, psychological thrillers are one of the most reliably popular genres.

Not only is Netflix’s biggest hit of 2026 a psychological thriller that managed to outdo Stranger Things season 5 in terms of viewership numbers, but the streaming service’s second-biggest title of January 2026 was another entry into the genre. As such, it is not surprising that other streaming services are creating psychological thrillers of their own.

However, what is striking about Peacock’s All Her Fault is just how successful the Andrea Mara adaptation is. The eight-episode series follows a distraught mother whose son goes missing after she drops him off to play with a friend. What unfolds is a knotty, complex mystery that broke Peacock viewing records upon release.

All Her Fault Is A Perfect Psychological Thriller

All Her Fault stars Succession’s Sarah Snook as Marissa Irvine, a well-off working mother who starts the show trying to pick up her son from a playdate with his new friend. To Marissa’s horror, the woman at the address she was given says she’s never seen or heard of Marissa or her son, Milo.

It soon becomes clear that Milo was kidnapped, and Marissa must go to great lengths to get her son back. A wealth manager, Marissa, is married to Jake Lacy’s commodities trader, Peter. Peter supports his sister, Lia, a recovering addict played by The Bear’s Abby Elliott. Meanwhile, Dakota Fanning steals All Her Fault as Marissa’s new friend, Jenny Kaminski.

A fellow mother, Jenny helps Marissa in her desperate search for her missing son when Marissa is frustrated with the apparent inaction of the police. However, Michael Peña’s Detective Alcaras soon starts to look into both the Irvine and Kaminski families and uncovers a dark, complex web of deception between them.

Anchored by a stellar central turn from Snook, All Her Fault is one of the best psychological thrillers of the last year. This is an impressive achievement when Netflix alone released Run Away and the surprisingly grisly His & Hers in January 2026, but All Her Fault outdoes both with its dark twists and believable story.

All Her Fault’s Peacock Success Starts A Great Trend for the Streaming Service

All Her Fault’s critical success was matched only by its superb reception among viewers, as the show swiftly rose through the rankings to become Peacock’s biggest hit ever. While its starry cast no doubt played a role in this success, All Her Fault’s clever plotting and twisty storytelling also deserve some credit for its success.

The outsized success of the miniseries may well lead Peacock to commission more psychological thrillers adapted from novels in the future, as this format clearly works for the streaming service. Most of its competitors have already leaped on this trend, as evidenced by Netflix’s commitment to adapting no less than 14 Harlan Coben novels since 2022.

Although a weekly release strategy might have made All Her Fault’s story even better, the show’s release was almost flawless. With shows like The Girlfriend and Lazarus, Prime Video has shown that it is no slouch when it comes to psychological thrillers, and Netflix’s upcoming shows The God of the Woods and The Hunting Wives season 2 provide even more competition.

However, the success of All Her Fault should still be enough to compel Peacock to produce more content in this subgenre. Unlike its competitors, Netflix and Prime Video, the streaming service hasn’t focused heavily on psychological thriller novel adaptations before now.

This means the genre could be a potential goldmine for the streaming service, and they ought to jump on this opportunity while All Her Fault remains popular. Luckily, the streaming service won’t need to go far to find more inspiration, thanks to author Andrea Mara’s sizable back catalog.

All Her Fault Has The Perfect Follow-up

All Her Fault’s writer, Irish author Andrea Mara, has seven other books in the psychological thriller genre, none of which have become TV shows yet. Peacock should capitalize on this and, as Netflix has with its next Alice Feeney adaptation, adapt more of her work.

2017’s The Other Side of the Wall, 2018’s One Click, 2020’s The Sleeper Lies, 2022’s Hide and Seek, 2023’s No One Saw a Thing, 2024’s Someone in the Attic, and 2025’s It Should Have Been You could all become future Peacock shows. This would give the streaming service plenty of inspiration for new psychological thrillers.

Moreover, it would mean that Peacock’s entries into the genre have a consistent voice. Part of what makes Netflix’s Harlan Coben shows successful, or the Caroline Kepnes adaptation You a five-season hit, is the consistent voice of their source material. With Andrea Mara’s books, Peacock could have many more successes like All Her Fault in its future.