Vow of Deception by Rina Kent

“One of Us Is Lying” by Karen M. McManus is a young adult mystery novel centered around the suspicious death of a high school student named Simon Kelleher during detention. Simon, known for his gossip app that exposes secrets of his classmates, dies after ingesting peanut oil despite having a known allergy. The four students who were in detention with him—Bronwyn, the brain; Addy, the beauty; Nate, the criminal; and Cooper, the athlete—are all suspects. As the investigation unfolds, each character’s secrets are revealed, and they must navigate the complexities of high school dynamics, trust, and betrayal while trying to prove their innocence.