Warning: SPOILERS for the One Of Us Is Lying finale.
The Peacock Original series One of Us Is Lying is based on the book by Karen M. McManus but makes a major change to the reason behind Simon Kelleher's death. The result of an allergic reaction to peanut oil, Simon's (Mark McKenna) death happens in One of Us Is Lying episode 1, and once the police rule it a murder, his four classmates, Cooper (Chibuikem Uche), Bronwyn (Marianly Tejada), Addy (Annalisa Cochrane), and Nate (Cooper van Grootel) become suspects. One of Us Is Lying follows the four as they investigate their peers to try to get to the bottom of how and why Simon really died.
One of Us Is Lying uses stereotypes largely ironically to drive home its point about how trapped the characters are in their day-to-day lives and reputations. Even the supposed twists and secrets that accompany each character come as no shock: Addy, the pretty popular girl, cheated on her boyfriend; Bronwyn, the star student, cheated on a test to keep up her GPA; Cooper, the varsity athlete from Mississippi, is secretly gay; and Nate, the bad boy, led to a classmate's overdose by selling drugs. One of Us Is Lying's high school stereotypes are the basis of Simon's social critique, but the show makes one very significant change to his motivations from the book.
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In One of Us Is Lying season 1's finale episode, the group learns that Simon was actually the one who planted the peanut oil that killed him, intending to prank everyone else in detention by having a severe allergic reaction. But Simon's plan relied on someone running to the nurse for spare EpiPens and saving his life—he never intended to die. The reveal gets worse
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