Peacock announced it will develop a limited series based on Andrea Mara’s April 28, 2026 bestseller Such a Nice Girl. The project will be written and executive‑produced by Megan Gallagher, who created the 2025 hit All Her Fault, and produced by Carnival Films, a division of Universal International Studios.

The decision follows Peacock’s record‑setting launch of All Her Fault in November 2025. The eight‑episode mystery thriller, starring Sarah Snook, Jake Lacy and Dakota Fanning, became the streamer’s biggest original launch, accumulating 45 million hours viewed in its first four weeks. The series also earned two Golden Globe nominations and was named Sky’s highest‑performing drama of 2025.

Carnival Films, headquartered in London, has a long history of producing television for major UK and US broadcasters. In 2021 the company partnered with Peacock and Universal International Studios to adapt Mara’s 2021 novel All Her Fault into a limited series. The collaboration was renewed for The Break‑In, an adaptation of Katherine Faulkner’s novel, which was recently green‑lit by Peacock.

According to Peacock’s President of Scripted Content, Lisa Katz, Such a Nice Girl is “exactly the kind of project we look for—smart, propulsive and immediately compelling.” Katz added that the combination of Mara’s gripping novel, Gallagher’s writing and Carnival’s production expertise gives the project “real momentum right out of the gate.”

Megan Gallagher, who has written and executive‑produced the All Her Fault series and the BBC psychological thriller Wolf, said she is “incredibly excited and grateful” to adapt Mara’s new novel. Gallagher highlighted the story’s twists and the exploration of female friendship, noting that she is working again with Carnival Films and Peacock.

Carnival’s Gareth Neame and Nigel Marchant, who will serve as executive producers alongside Gallagher and Mara, expressed enthusiasm about the partnership. Marchant said the studio is “thrilled to bring this team together again for a brand‑new original series.”

Andrea Mara, author of nine novels and a UK and Irish bestseller, praised Peacock’s confidence in her work. She said she “can’t wait to see where they’ll take this story.” Mara’s novels have sold over one million copies in the UK and Ireland.

Peacock, owned by Comcast’s NBCUniversal, launched on July 15, 2020 and has grown to 44 million paid subscribers as of January 2026. The platform has positioned itself as a major player in the streaming market, offering a mix of NBCUniversal library content and original productions.

The Such a Nice Girl storyline centers on two best friends, Siobhan and Grace, who wake their 24‑year‑old daughters after a luxury wedding. The next morning they discover a smashed lamp, an abandoned phone and blood on the carpet. Over the following days the truth unravels, testing the friends’ relationship and revealing that one daughter may be a killer.

The production will be handled by Universal International Studios, with Carnival Films and Peacock collaborating on development and production. The series is expected to follow the successful model of All Her Fault, combining a strong literary source with a proven creative team.

Peacock’s strategy of partnering with established writers and production companies has paid off with All Her Fault and The Break‑In. The new project adds to a pipeline that includes other Peacock originals and demonstrates the platform’s commitment to high‑quality limited series.

The series is slated for development in 2026, with production timelines and release dates to be announced later in the year. Peacock’s continued investment in original content and its partnership with Carnival Films signal the streamer’s intent to maintain its position as a leading destination for premium limited series.

The announcement comes as Peacock continues to expand its subscriber base and compete with other streaming services. The platform’s focus on original programming, particularly limited series with strong narrative foundations, remains a key differentiator in a crowded market.

In summary, Peacock has secured the rights to adapt Andrea Mara’s Such a Nice Girl, with Megan Gallagher writing and executive producing and Carnival Films producing. The project follows the success of All Her Fault and The Break‑In, and is part of Peacock’s broader strategy to deliver compelling limited series to its growing subscriber base.