(Completed) Thirteen children have to give up a day of their precious fall break, and they aren't happy. Due to either misbehaver or bad grades, these teens must come back to school for a day. They soon realize that it's not going to be as boring as they all expected. A madman has been living in the school in secret for quite some time. He has been sleeping in the celling, and had waiting for the perfect moment to strike. The supervisor has to leave the kids all alone, and the man does what he does best. He attempts to sell their organs on the black market, and he does it in style. A terrifying style. Warning: This book is very gory, and talks about murder. If you are squeamish I don't recommend this book. Because of this I have marked the book as mature. 1