21 Days of Fear

A Letters Thriller

By: Herve Commere

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Hardcover | 24 September 2026

At a Glance

Format
Hardcover

Age
14 - 99

Dimensions(cm)
15.8 x 21.8 x 3.5

Hardcover

$45.75

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A chilling YA thriller told through 21 sealed letters, with the suspense building day by day.

What would you do to bring your sister back from the dead?

After Lucas’s sister mysteriously disappeared ten years ago, his family was torn apart. His mother has been lost in a deep depression ever since, his father has been unable to speak of what happened and Lucas has been trapped in his guilt . . . until he receives a note that changes everything.

Lucas has twenty-one days to find out the truth about what happened to his sister, and save her life . . . . if she really is still alive.

Every action is watched, every choice counted. Can he save his sister without losing himself?

Open one sealed letter each day and experience the mystery as a real-time countdown - or tear through all twenty-one, if you can’t bear to wait.

What to expect:

21 sealed letters to open
A gripping missing-person mystery
Dark family secrets
Twists, clues and shocking revelations
A tense twenty-one-day countdown
An immersive reading experience perfect for fans of high-concept YA thrillers

About the Author

After studying modern literature, Hervé Commère became a bartender and a bar owner. He is the author of several short stories and novels in French, including Les ronds dans l’eau, winner of the Prix marseillais du polar; Imagine le reste, winner of the plume de cristal at the international Festival international du film policier de Liège; Ce qu’il nous faut, c’est un mort, Prix Polars Pourpres et Prix Polar à Mauves-sur-Loire; and Sauf, which was well-received by critics and general audiences alike. His work has been translated to Japanese, Chinese, and English.

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