As Raban lay dying, a casualty of the attack on the angel city, he implored his daughter, Miriel to build a sanctuary to keep the children safe from further attacks.

Miriel comes up with her own plan to keep future offsrping safe from the Fallen. She's going to hide them on Earth amongst humans.

Eighteen years later she goes to check on Lina.

Lina finds out a couple of days before her eighteenth birthday that she is an angel. Her life changes forever as she deals with the consequences of this discovery, fights for her life and has to make the biggest choice of her life so far.