Twisted Empire by Eva Chance

The past has come back to haunt us… way too literally.
Our investigation into my dad’s murder has taken an even stranger turn than I could have imagined. One that’s shattered everything my stepbrother and long-time love believed about himself and his family. One that’s thrown all of our plans for a loop.
But the four guys standing by my side won’t back down, and neither will I. If there’s a way to see justice served, we’ll find it.
And if there isn’t… then at least we’ll go down together.