Elysium is the OneCreator’s ice-winged assassin, a skilled killer whose past has made him numb and bored with eternity. Despite everything he’s been through, he keeps returning to hear the Singer in the Velvet Cage—to her. Fiamma is a human transformed into a Scourge, forced to sing because her voice is a weapon against others of her kind, penetrating their minds and causing them unimaginable pain.

Ely tells himself he hates her because of what she is. But amidst the growing rebellion in OneWorld, he rescues the one female who unravels him and makes him feel something. His hate begins to look dangerously like longing.

Fiamma’s man-dar has been broken for a long time, but something in this cold avenging angel, as she calls Ely, is special. She sees what others can't—a man still capable of warmth if she can breach the frozen walls he’s built around his mind and heart.

But Ely made those walls to protect himself. Letting her in could shatter him. Together, they uncover secrets, face deadly foes, and forge a bond that could change them forever. But as war looms and old powers stir, their love may not be enough to save them and OneWorld.