A literature assignment i wrote in the 5th grade

Whats going on?

So a little girl named Cassidy and herlittle brother josh were on their way to their favourite part of the house, The huge library. They snuck into the library and soon they heard a voice... The voice was telling them to come in. They went inside but as soon as they did they got locked inside! Then they heard banging. BANG! BANG! then someone whispered"i know you are in there and ill do whatever it takes to come in..." Cassidy and Josh panicked but they saw a fireplace. They come in the library everyday bit never have they seen the fireplace there even more it was in an unusual place right in the middle of the room...