A Battle of Blood and Stone - Sawyer Bennett - Bog

Another day, another step closer to Hell on Earth being unleashed.
With every piece that falls into place for the queen of the Underworld, Kymaris gains strength and power that will make it more difficult to defeat her when the time comes. It feels as if we're in a desperate race to get just one step ahead of her, but my demise feels closer than it ever has before with still so much to do.
The first order of business is to unlock the angelic powers with which I was gifted at birth, and Carrick insists on getting help from my archnemesis to do so. Yes, I have to save the world, but my priority has now become rescuing my sister from the Underworld. While there are many questions still to be answered about my long-lost twin, I know I will not win this battle without her by my side.
In the midst of all the doom and gloom, Carrick has become my beacon of shining light. Our connection unimaginable, my heart recognizes his as the other half of its whole. Inexplicable and deeper than one could ever imagine, the love I hold for him is forged by destiny, however ill-fated it may turn out to be.
And those are the feelings I must hold close...to keep me going. Because a painful lesson is on the horizon-betrayal never comes from your enemies.
A Battle of Blood and Stone is book four of the Chronicles of the Stone Veil series and is best enjoyed if read in series order.