So, One of Us Is Lying is not based on a true story. The new Peacock original series is based on a 2017 suspense novel of the same name written by Karen M. McManus. The book's central idea revolves around bringing high school students that are from completely different backgrounds and putting them in a situation where they're forced to get to know each other.

Even though Karen was not directly involved in the creative direction of the television series, she was consulted when her book was being adapted to the small screen. It's been said that her deep knowledge of the characters and narrative was a huge help in the process. Since Karen's novel had a significant fan following, she had a list of crucial moments in the story that readers especially enjoyed.

That list was given to the producers, who made sure to keep One of Us Is Lying's story arc as close as possible to the novel. In an interview with Entertainment Weekly, creator Darío Madrona discussed the murder mystery and how close it follows the book. He shared, "We all love the book, so we wanted to be faithful to it."

He went on to say, "We've been faithful to the spirit of the story and the themes and the characters, but also trying to add some little twists and turns here and there so we can surprise readers of the book, expand the story a little more. We tried to be faithful because the book is great. But at the same time, we wanted to add a little more spice to it and more elements to play with, and hopefully surprise people who read the book and think they know what's coming."

The first six episodes are available for streaming and the final two episodes of Season 1 will be available to watch on Oct. 21.

One of Us Is Lying is available to stream on Peacock.