Astrid went to sleep after her father's death in Ireland and woke up in New York City. She's never felt she belonged in her new life, but her family refused to speak about "before". A spur of the moment decision quitting her job opens up the chance to return to Ireland and try to put together the pieces she can't remember. Until an actual unicorn appears in her kitchen, and she has no desire to remember anything.

Ronin would give his life for the king, but masquerading as a human to protect his daughter is almost too much. Astrid isn't safe in their realm thanks to her human blood, and Ronin can't seem to ignore the unicorn blood coursing through her veins any more than he could resist her beauty.

When betrayal strikes, Astrid learns she doesn't belong with the unicorns anymore than she did with the humans. When the lies of the past put Astrid in danger, she has to trust Ronin to protect her. Ronin can't decide if the best place for Astrid is in his realm or hers. He just knows he wants to be by her side, even if it means losing part of himself or herself to make their connection work. A war is coming and she won't be safe there, but sending her home alone isn't an option.

Astrid's forgotten past is within her reach. Robin's greatest mission is to protect a princess who doesn't belong while a war brews in the background. They'll have to reconcile in order to keep peace within the Realm of the Fae.