This book is definiatly not for the light hearted and it touches on subjects that are generally 15+ ish and obviously death.
Before I Die follows the end of the life of Tessa Scott who has a type of leukemia that is slowly wasting away her body. Without giving any major spoilers, Tessa at the start of the book has a list with acts on there as such as sex, drugs, breaking the law etc. (That's why I said it should be for more mature readers)
I couldn't really put it down and I just loved it from start to end. A good book to read for an emotional roller coster!
Comment below if you have read Before I Die and your opinions on the book!