Karen M. McManus delivers a compelling whodunit that successfully modernizes the classic "Breakfast Club meets murder mystery" premise. The story follows four stereotypical high schoolers—Bronwyn the brain, Addy the beauty, Nate the criminal, and Cooper the athlete—who become prime suspects when their classmate Simon dies during detention after drinking water laced with peanut oil.

What elevates this beyond typical YA fare is McManus's skillful character development. Each protagonist breaks free from their initial archetype as secrets emerge: Bronwyn isn't as perfect as she seems, Addy discovers her own strength beyond her boyfriend's shadow, Nate reveals vulnerability beneath his bad-boy exterior, and Cooper grapples with hiding his sexuality.

The rotating perspectives keep readers guessing while building genuine emotional investment in each character's journey. The pacing is expertly managed, with revelations doled out strategically to maintain momentum without feeling manipulative. McManus handles contemporary issues like social media, cyberbullying, and LGBTQ+ identity with authenticity, never feeling preachy or forced.

The mystery itself is satisfying, with clues fairly planted and a resolution that feels earned rather than convenient.

However, some plot conveniences strain credibility—particularly how quickly the four suspects bond and trust each other despite their vastly different social circles. The adults in the story often feel one-dimensional, existing primarily to create obstacles rather than as fully realized characters. Additionally, while the diverse cast is refreshing, some character arcs feel slightly rushed in the final act. This book excels for readers who enjoy character-driven mysteries with contemporary relevance. YA fans will appreciate the authentic teenage voices and social dynamics, while adult readers can enjoy the tight plotting and nostalgic high school setting. Skip this if you prefer literary fiction, dislike multiple POV narratives, or want more complex adult characters. It's perfect for fans of mystery series, book clubs seeking accessible page-turners, and anyone who enjoyed shows like "Pretty Little Liars" but wanted better character development.