Confined by Heaven. Chains of Blood, #1

The day started as any other day would. Bellamy Delacroix was shopping with his brother, and then he headed home to the inevitable discussion about his future with his mother. A woman who still cooks despite technology that doesn't require her to, his mother is an old-fashioned type in a future world. Then, his world explodes quite literally, and he's swept up into a world beyond his imagination. A war between extraplanar creatures who call themselves angels and demons draws him in because of what he is.
And what he is, no one has ever seen before-a Nephilim. He is the child of an angelic mother and a demonic father and is thus capable of channeling both the positive and negative energies of the planes. This makes him dangerous and a target for both the minions of heaven and hell.?An angel named Saniel takes him under her wing and helps him adjust as he is brought to the underground city of heaven, Elysium.
He learns about what he is, who they are, and their enemies in Zion, the demons. A warning from an ally of his mother, though, rings in his head, and he wonders who he should really be trusting. Things begin to spiral in ways he doesn't understand, and the world is changing before his very eyes.