How I became a ghost

SINCE YOU'RE READING my second book, you already know who I am. You know my name is Isaac, that I'm ten years old, soon to be eleven, and you know I am a ghost. I am not dead, not in the usual way. I am not buried and gone, but I am a ghost. I have learned to travel by closing my eyes and thinking where I want to be. That's how ghosts do it. I can disappear so no one can see me or I can gradually float into sight, as you will recall. But I didn't...