Someone brought a knife to the party.

To celebrate the end of high school, Izzy Morales joins her ride-or-die Kassidy and five friends on a 1920s-themed getaway at the glamorous Ashwood Manor. There, Izzy and her friends party in vintage dresses and expensive diamonds--until Kassidy's boyfriend turns up dead.

Murdered, investigators declare when they arrive at the scene, and now every party guest is a suspect. There's the girlfriend, in love. The other girl, in despair. The old friend, forlorn. The new friend, distressed. The brooding enigma. And then, there's Izzy--the girl who brought the knife.

To find the killer, everyone must undergo a grueling interrogation, all while locked in an estate where, suddenly, the greatest luxury is innocence.

Seven friends throw a 1920s-themed party, where it's all pretend--until one of them is murdered. One of Us Is Lying meets Knives Out in this killer mystery!

Goodreads Choice Award Nominee

Target Book Club Pick

Amazon Editor’s Pick

Der Spiegel Bestseller

A delicious, twisty, and clever locked-room mystery with loads of glamour and danger that will keep readers rapt until the very end.  A can't miss for mystery fans.

- Kathleen Glasgow, New York Times bestselling author of Girl in Pieces and The Agathas

Agatha Christie meets Karen M. McManus in this suspenseful mystery. . . . Muñoz captures the spirit of the classic mystery, deftly weaving the threads without missing a plot point. A strong debut from a promising new voice.

- Booklist

Alongside the central mystery, the author successfully explores a host of serious issues, including substance abuse, risky sexual behavior, and the armor of socioeconomic privilege....An un-put-down-able, bittersweet whodunit."

—Kirkus Reviews

In classic Clue fashion, debut author Muñoz delivers a nail-biting mystery. . . By skillfully molding tension via well-placed clues and gripping dialogue, the creator believably cultivates shocking reveals and bittersweet resolutions."

—Publishers Weekly

A compelling narrative that not only entertains but also sparks important conversations about privilege, social issues, and moral choices. It’s a book that will leave a lasting impact on its readers, making it a truly unique addition to the young adult literary landscape.

—Armadillo Magazine

Contains all the best elements of the classic cosy locked-room murder mysteries, with its own glamorous twist - bittersweet and captivating right through to the final page.

—Ravena Guron, bestselling author of This Book Kills and Catch Your Death

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