Marked is very clearly aimed and marketed at mid to late teenagers. As an older reader (mid-30s) I found the incessant teen-speak was a little over done, but I am not part of this series' main demographic.
This first book in the House of Night series is not the strongest by any means but it does introduce the character Zoey Redbird and her loyal friends. Zoey has been Marked, this means she has the genetic predisposition to become a Vampyre. This means she needs to move into the House of Night (Vampyre finishing school) in order for her transition to have the best chance of success.
It soon becomes apparently that Zoey is no normal fledgling Vampyre. It seems that she has been chosen by the Goddess, Nyx and the path she must follow will not be an easy one.
This is not your average vampire novel, nor is it your average coming of age tale. It is an original and quirky take on both. It can be slow going at times, and often irritatingly repetitive, but uf you stick with the series there are great rewards to be had.
Give this booka chance. If it doesn't blow you away, buy the second and give that a chance as well, as it is much better.
Although aimed at teens there are definitely adult themes. Sex, drugs, homosexuality and paganism all feature to varying degrees.
I have enjoyed the first 5 books greatly and look forward to the remaining titles in the series.