The Off Campus author writing a serial-killer thriller under a pseudonym was already one of the most exciting publishing pivots of 2026. The fact that Marlene King, the creator of Pretty Little Liars, is now developing it for Hulu makes it genuinely one of the most exciting YA thriller announcements of the year. These two names together feel almost too perfectly matched. And yet here we are.
Hulu is developing a TV adaptation of Elle Kennedy’s novel Thornbird, with Pretty Little Liars creator Marlene King set as writer and executive producer of the 20th Television project. Kennedy will executive produce alongside King and Lauren Wagner.
Kennedy confirmed the news on Instagram, and her excitement was hard to contain. Her readership reacted just as quickly.
Who Is Elle Kennedy?
Most of Kennedy’s readers know her as the author of the Off Campus book series, one of the most beloved college hockey romance series ever written, which Prime Video adapted into a television series that premiered in May 2026 and reached 36 million viewers worldwide in its first 12 days.
Season 2 is in production, and Prime Video is also developing an adaptation of her novel Girl Abroad.
Thornbird is a significant departure from everything Kennedy has published before. It is her first novel written under the pseudonym E. Kennedy and her first foray into thriller fiction. She has spoken about the creative challenge and the deliberate choice to signal to readers that this was something different.
The fact that it debuted on the New York Times bestseller list immediately upon release on June 30, 2026, says everything about the loyalty of her readership and how strongly the book landed even outside her established romance audience.
What Is Thornbird About?
The official synopsis sets up the premise with the precision of a great thriller logline:
Ten years after her father—the infamous serial killer Gabriel Thorn—was caught, Ryan Shipley is back in Starling, Tennessee, trying to lay low. No one can know who she really is. No one can know the truth about her past. But as fresh eyes dig deeper into the case, old secrets refuse to stay buried.
Seventeen-year-old Ryan returns to her childhood hometown hoping to build a normal life, experience typical teenage things, and potentially fall in love, while concealing her identity and her connection to her father entirely. That last part becomes considerably more complicated when the case starts reopening around her.
It is a coming-of-age thriller about a girl at the center of her own true-crime mystery. The Pretty Little Liars connection becomes obvious the moment you read that description. Secrets, a small town, a teenage girl trying to control a narrative that keeps slipping out of her hands. Marlene King has spent her career in exactly this space.
Why This Pairing Makes Complete Sense
Marlene King is a writer, producer, and director best known for developing Pretty Little Liars based on Sara Shepard’s book series, serving as showrunner across all seven seasons of the Freeform hit that tackled sexuality, mental illness, and, most relevantly, the specific paranoia of being a teenage girl with secrets in a small town that is always watching. She also wrote the screenplay for the coming-of-age film Now & Then.
That body of work maps almost perfectly onto what Thornbird needs. Ryan Shipley navigating Starling, Tennessee while hiding who she is, in a town where old secrets refuse to stay buried, is precisely the kind of story King has spent her career learning to tell.
No cast has been announced, and no premiere date has been set. The project is in development.
Old Secrets in a Small Town
Thornbird is on shelves now, published on June 30, 2026. If you are an Elle Kennedy reader who hasn’t yet made the jump from her romance novels to her thriller debut, this is the moment to do it.
And if you are a Pretty Little Liars fan who has been waiting for Marlene King to return to the kind of story that made that show essential viewing for a generation of teenagers, the wait is officially over.
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