All Our Yesterdays — Karen Janowsky

Love is hard, even for superheroes.

Nina and Daniel have never known any destiny other than fighting their separate masters' wars. Now, a secretive organization is creating a weapon that will collapse history. Their fight is to stay together. It takes them on a journey around the world and into another dimension.

Nina and Daniel now face risks beyond their imagination. Sacrifices must be made, and time is running out.