Brotherhood of Darkness: Vow of Vengeance by Hilary Storm

They’re always watching…
Waiting…
Ready to make you pay their price.
We were in, or so we thought. Turns out the society wasn’t finished making us prove ourselves. They weren’t playing by any rules, nothing was off limits, not even Iris. However, they weren’t anticipating the lengths we’d go to for our love. We’d sacrifice anything and everything – money, power, and even our own life.
One would pay the ultimate price.
Two would come for vengeance.
And in the end, you’d never see the twists coming.