The Gymnasium Mystery

By Pau .

When the lights go out in the gymnasium, something ancient wakes up in the walls... and it wants a soul.

The Gymnasium Mystery: Book One - The Doorway Takes Its First Soul is a dark supernatural thriller where loyalty, fear, and the unseen collide inside a school that should have been safe.

Eva only wanted a normal day at training. Instead, the mirrors crack, the halls rearrange, and shadows begin to whisper her name. Alongside Tito, a nervous Chihuahua with a bigger heart than courage, and Angie, a ghostly Labrador who refuses to stop fighting, Eva uncovers a terrifying truth:

Some students are marked.

One of them is the doorway.

And at midnight, the shadow comes to collect.

As the gym transforms into a shifting maze of vents, lockers, and broken glass, Eva and her friends must choose: run, hide, or make a stand against something that doesn't just want to scare them-it wants to consume them. The more they resist, the more the shadow evolves, learning their fears, mimicking their voices, and hunting their weakest thoughts.

When the hour strikes and the boundary between worlds snaps open, Eva faces an impossible choice: protect the one she loves most... or watch the doorway claim its first soul.

This book is for readers who enjoy:

Dark supernatural thrillers set in schools and gyms
Emotion-driven horror with strong friendships and sacrifice
Stories told through the eyes of dogs and cats in a very human world
Slow-building dread, psychological tension, and terrifying climaxes
Series that end on powerful cliffhangers and lead into the next book

Content & Trigger Warnings:

This story includes supernatural horror, intense suspense, possession themes, animal fear and injury, emotional trauma, abandonment, and references to death. There is no graphic gore, but the atmosphere, tension, and emotional stakes are strong.

This book is not recommended for young children. Ideal for mature teens and adult readers who enjoy dark, emotional, and unsettling stories.

Step into the gymnasium.

Follow the shadows.

And remember: when the doorway opens, not everyone comes back.

Start Book One of The Gymnasium Mystery today.

• Format: Paperback
• Language: English
• ISBN: B0G2JDWWJG
• ISBN13: 9798274702164
• Release Date: November 2025
• Publisher: Independently Published
• Length: 374 Pages
• Weight: 1.10 lbs.
• Dimensions: 0.8" x 6.0" x 9.0"