One of Us Is Lying centers around a group of five high school students, who have only one thing in common: They all get detention on the first day. This includes brainiac Bronwyn Rojas (Marianly Tejada), bad boy Nate Macauley (Cooper van Grootel), popular cheerleader Addy Prentiss (Annalisa Cochrane), jock Cooper Clay (Chibuikem Uche) and outsider Simon Kelleher, who is the show’s narrator.
It’s important to note that some of the students, like Bronwyn, claim they’re in detention by mistake. (FYI: She receives a citation after a cellphone goes off in class. Although it comes from her backpack, she says it doesn’t belong to her.)
Things take a terrifying turn when the proctor dismisses herself, leaving the five students alone in detention. At one point, Simon drinks a cup of water and begins gasping for air and grabbing his throat before asking the other students to fetch his EpiPen, which can counteract an allergic reaction. The problem? It’s MIA from his bag, and he’s deathly allergic to peanuts. Even worse? All the EpiPens are missing from the nurse’s office, too.
When the police investigate the fatal—yes, fatal—incident, they discover that Simon’s cup was mysteriously coated in peanut oil, which can only mean one thing: Someone in that room killed him. The question is… Who is lying?