A baby on the way. A demon prince on the warpath. And Halloween in Vegas just became Hell on Earth.

Delia Dunne thought navigating a relationship with a quarter-demon house flipper was complicated enough. Then she discovered she's pregnant ? and the baby's unique bloodline makes them both targets for every supernatural faction in Las Vegas.

Caleb Lockwood escaped Hell once. He won't let it claim his family now. But when anonymous threats escalate to hacked medical records and sinister text messages, even his demonic powers might not be enough to protect the woman he loves and their unborn child.

Their worst fears become reality on Halloween night ? Delia is abducted, their wards are shattered, and the kidnapper isn't just any demon. It's Daniel Lockwood ? Caleb's half-demon father, who isn't trapped in Hell after all. He escaped carrying the power of a fallen demon prince, and he's got plans for his grandchild that involve opening a permanent gateway to Hell.

Now Caleb and Delia must storm a demon stronghold in the heart of the Vegas Strip, combining hellfire and psychic energy in a desperate bid to save their future. But Daniel's not just after power ? he wants to corrupt his son into the monster he's always believed Caleb to be.

The battle may be won, but the war is just beginning. And with a hell gate set to open on the black moon, time is running out.