Zelda is one of the greatest spy agents of all time. She is summoned when something extremely hard needs to happen on the down low. She searches for things that shouldn't exist, performs missions that never make it to the papers, and investigates targets that governments claim they don't acknowledge.

Trained from adolescence under her father’s rigid command, Zelda became more weapon than woman, precise, cold, efficient. Every operation is a calculation, every move rehearsed. She doesn’t miss, she doesn’t hesitate, and she doesn’t ask questions.

But under her tough surface, there is a bit of the girl she used to be, a small piece of kindness hidden under many layers of rules and quiet. Zelda doesn’t believe in fate, but she still holds onto the faint memory of a promise she made a long time ago, one that stayed with her even after all she has removed from her life.

To everyone, she is Nightfall, the calm figure that stops trouble before it starts. She is a phantom in her own head seeking the recollection of who she used to be.