One of the stranger recent cultural shifts is that teenage fiction has become a branch of oncology. Cancer is rampant. You're barely a chapter in before a tumour erupts or a lymphatic system turns nasty. Young heroes and heroines are terminal from page one, or a friend is, or a parent. The shadow of premature death has fallen upon the genre: one half-expects Waterstones to be staffed by Macmillan nurses.
It is axiomatic (though wrong) that teenagers will read only books that reflect teenage experience.