The Unknown Secret

Caleb lives a normal teenage life. Going to school, arguing with his parents, like hot girls, gets good grades, etc... All of that changes when something tragic then happens in his life. His parents both died of suicide(at least the cops say). Caleb blamed himself. He went to a orphanage and met some pretty "crazy" people. They started telling him things about the "Spirit" world. How to connect with them, see them, talk to them. They even gave him a notebook about something that he didn't care to know about. But there is more about this notebook than he thought. He starts seeing spirits everywhere, in the hallway of his school, at the orphanage, even when he just goes to the mall. He sees them everywhere, but one tries to hurt him. One after another they start noticing that he can see them, and try to attack them. He then finds himself followed by something inhuman looking. It reveals itself as a Shinigami, God of Death, and tells him about the notebook, and it's dangers. What is so bad about this book that a God of Death follows him around, and most of all, what are the " dangers" about this book? Will he find out on time, or will he have to face the most dangerous beings in the universe?