Lawless Kingdom by Natalie Bennett

When something is forbidden, it becomes maddeningly tempting.
Judas Barron, for example. Wicked blue blood and heir to a severely twisted cutthroat society.
Everyone knew who he was and what crew he ran with—a clandestine group of filthy rich kids surrounded by ominous secrets. Secrets that were rumored to be dark, dirty, and stained with blood.
It was never my intention to get tangled up with them, but Judas and I had a secret too, one he was determined to make sure I took with me to my grave, which meant keeping me by his side.
Now forced to be part of a savage coterie, I start to see his world through a new pair of eyes. It isn’t long before temptation becomes something dangerous and wild, breeding the sickest kind of infatuation.
And those secrets Judas keeps?
They’re about to tear my life apart.