Horns or halo?

Hi , I'm Jessica and I'm ten ! I love Jacqueline Wilson and she inspired me to write this book , I hope you like it!
This is about a brother and sister , but one day the girl finds out something she wants nobody else to know about, because she isn't supposed to know herself! Please don't skip to the best bits ! Thank you.

Sorry if I spell anything wrong or it says something that I didn't mean to put or there's punctuation marks in the wrong place , that might be the spell checker. Thank you!