Ruthless Princess (Mafia Royals #1) by Rachel Van Dyken

A mafia romance about best friends turned enemies by Rachel Van Dyken, the number one New York Times bestselling author of the Eagle Elite series.

The enemy of my enemy is my friend…
I never thought my father would ask this of me, to become the second generation at Eagle Elite University, to rule with an iron fist, and to take care of anyone who gets in our way.
But ever since the incident.
Ever since Him.
There’s been a war in our little clique.
After all, a house divided cannot stand.
He’s the problem, not me.
He used to kiss me like I was his oxygen.
Now he looks at me like I’m his poison.
But we both drank it, again and again, never believing there would be a day when our love would start a war.
And our friendship would shatter into a million pieces.
Then again, the worst thing you could do in the mafia is hang on to hope that your life will be normal.
The second worse thing?
Fall in love with your best friend.
Enemy.
And heir to the Nicolasi throne.