Good "TEEN" books to read!

I would suggest the Evermore and Pretty Little Liars series.
Evermore is about a girl who loses her family in a car accident and from the accident she gains supernatural abilities.
Pretty Little Liars is about a group of teens who lose their leader and are tormented by the "killer". It has a lot of mystery and suspense.

Also a good mystery writer I would suggest is Agatha Christie.