OnomatoPemily: And the Mysterious Noise (Unabridged‪)‬

Pemily is a 10-year-old girl who has just started at a new school. She is nervous about fitting in and making friends, but is soon drawn into a mystery when she and her classmates hear a strange noise coming from the school's basement. 

Determined to uncover the source of the noise, Emily and her friends start looking for clues. They find a locked door with a mysterious symbol on it, and believe that it is connected to the noise. Emily becomes increasingly obsessed with solving the mystery and starts to connect the dots.