Cal Olin is a grudging member of the Immorti. A resurrected Aztec warrior, he knows he has much to atone for but doesn't believe waiting for an enemy who hasn't appeared in hundreds of years is the best way to do it. He'd prefer to spend his time in his CEO role with Civica, an organization dedicated to righting wrongs.

However, when Cal sees the unconscious body of a woman near a magical portal, he knows the long period of peace has come to an end. He's shocked to discover the woman is Dr. Iliana Rogers, Civica's second-in-command. The beautiful, argumentative thorn in his side has managed to open the gate and set off a chain reaction that could end the world. Is she an agent of evil or an unknowing pawn? He has to find out.

Nightmares have taken over Iliana's dreams and with Cal, she no longer feels alone. But when he breaks into her house and tells her, incredibly, that he's immortal, she knows she's been living an illusion. It's a shock to find out he was telling the truth and that her own mother was an agent of the malevolent Nilohum—and that she herself is fated to end the world.

As Iliana searches for the truth, Cal struggles with a terrible choice: does he help the woman he loves, or does he stop the end of the world and risk Iliana's love…and life?