Luna, a pregnant 19-year-old on the run from mysterious dark creatures, stumbles upon a black brick castle belonging to the Harbingers - a family that protects humans. To her surprise, the man who emerges is Cedric, a Fey she met briefly before. Cedric reveals the creatures want Luna's baby for its potential special powers. As they hide out in the castle, Luna and Cedric's feelings for each other resurface, despite their difficult history. When the creatures track them down and attack, the injured Cedric proposes a risky plan - luring the creatures to the Harbingers' hidden fortress to defeat them once and for all. The fate of Luna, her child, and the Harbingers hangs in the balance.