Four seconds.
That is all it takes for the lights at Laura's school to go out.
The first time, she assumes it is just a fault.
The second time, she starts counting.
Laura has only just begun her first year of high school, and she already has plenty to think about: new classmates, new teachers, confusing schedules, and corridors where getting lost is far too easy.
Then she notices Tommi.
Not long ago, he used to fill entire notebooks with drawings. Now he leaves the pages blank.
And that is not the only thing that does not add up.
The lights always go out for exactly four seconds. One corridor seems to have impossible dimensions. Old photographs do not match the school records. And someone inside the school appears to know details Laura and her friends have never told anyone.
Together with Marco, Sofia, and Carlo, Laura begins following the clues: forgotten documents, old photographs, hidden spaces, and names someone tried to erase.
Until they discover that an entire class has disappeared from the school's history.
But the closer they get to the truth, the clearer it becomes that they are not only investigating something that happened many years ago.
Someone is still acting in the present.
And when curiosity turns into danger, Laura and her friends will have to decide how much they are willing to risk to uncover what is really hidden behind the mystery of the Erased Class.
The Erased Class is the first book in the High School Adventures series: a mystery adventure about friendship, school life, secrets, danger, and unexplained phenomena.
For readers aged 11 to 14, and for anyone who loves mysteries where every clue can change what you thought you knew.