Some of the most exciting series to appeal to young adults that use elements of the supernatural:

1) Harry Potter by J K Rowling

2) Not spooky at all but certainly about the supernatural: Twilight by Stephanie Meyer

3) The Mortal Instruments and The Infernal Devices by Cassandra Clare

4) The Wyrd Museum by Robin Jarvis

5) The Saga of Darren Shan by Darren Shan

6) The Walking Dead by Robert Kirkman and Charlie Moore