My 14 yr old has read both Shiver and Linger by maggie Stievfater they seem to come under the young adult section similar to the twilight books did. So they would be suitable for both adult and children. My daughter loves this particular genre and i also enjoy reading it so i have read quite a few of the YA category of books lately as well as some of the general adult age titles. As for would we recommend my 14 yr old says a very loud YES! I think a lot of the authors are trying to appeal to a wider audience by appealing to both teenage/young adult and adults alike.
Jeanz thanks I think I'll give it a go then. I agree the line between YA and Adult novels is fairly blured now which I'm all for a good book is a good book regardless of the intended audience by the publisher.
There are loads of books and authors that write for both these days. If you like Shiver and that type of genre theres loads about Rachel Vincent does werewolf series, stray,prey, etc etc also i just started reading Rachel Vincents new Soul screamer series bk 1 My soul to take and am already half way through resisting the urge to read at the mo trying to keep my fingers/wrists moving by being on the laptop for a while unfortunately wrists etc painful today so no doubt will finish book later today