What's the secret, Charlie?

There lives a monster. So said Johnny. But Charlie doesn't believe him. Together with her classmate Dizzy, she will uncover the truth: who is hiding in the woods and leaving mysterious signs. But when the kids go into the forest, they suddenly find themselves in a trap: it unexpectedly gets dark around them — and they can't find a way out! Was Johnny right, and will they soon fall into the clutches of the monster?! How to understand the strange signs encountered along the way, defeat the darkness, and find a way out? And will this nightmarish night ever end? This incredibly captivating, at times eerie, and profoundly deep story was nominated for the prestigious Carnegie Medal.