I guess one could say there  must be a sort of balance between good and evil. It is often said that one CANNOT exist without the other. At first I was amused an entertained by Angela and Diabola the novel by Lynne Reid Banks, but as it progressed and became exceedingly darker, I read the jacket to  find that this book was recommended for ages 9-12. I don't think so. Especially in this day and age. Doing bad thing (especially super bad things) is never a good idea. However, there were a couple of things that bothered me about the story. I expected there to be some explanation as to the WHY the twins existed, something a little more magical or ethereal. The clever ruse of incorporating the two entities into one was interesting and the only way the author could justify Diabola's so called death, but I felt there should have been a little more explanation as where they came from. Also I felt there was a hint at Mrs. Cuthburtson-Joneses (the mother) having some sort of unrealized power that never was explored or expanded. I enjoyed the story, but I still don't think its right for pre-teens
However, there were a couple of things that bothered me about the story