Because of her high fever, the girl didn’t go to school, and at noon someone unlocked the door with their own key, put something into her mother’s coat, and left:

— Hello… yes, it’s me. I did everything the way you said. Tonight you can come with the police, yes, yes… I’m leaving now. Understood. Congratulations to us. That fool will never figure anything out.

The girl froze. The aunt was talking about her mother. And she was clearly planning something terrible.

The woman left as silently as she had entered. The door closed. The hallway fell still.

The girl rushed to the coat, slipped her trembling fingers into the pocket, and pulled out something that left her completely shocked  Continued in the first comment 

Inside the pocket was a small package. Tiny, tightly sealed, with something suspicious inside. She had no idea what it was, but she was certain of one thing: this was what the police were supposed to “find” and “congratulate” them for that evening.