This is the most craziest and horrible book ever read. Actually it was a gift otherwise never buy such a book.
1- If your kid is fine and normal this book will make a huge worry about fear about loss of its father very soon.
2- If your kid sleep well this book will made unlimited days or months of nightmare
3- The book starts with give some scientific answers to kids curiosity and then it struggle by itself how it would be possible to take out the heart without being died. We as parent are OK with imagination but all not partly it make kids mix and confusion and this is the point must be avoided. when you talk about fairly-tales it must live in their own magical lands not in your kids bed otherwise it going to be scary for kids.
Anyway I wondered who judge the books and if anybody asked kids about the story. I feel sorry for kids who may mind freaked by the book