Stormflower

THEY call and some hear.
On the ocean world Charybdis, two orphans were searching. When the corportacracy found them, they said they had no memory of their family —they lied.
Jade and Ilin Dieza were taken, raised to kill the inter-dimensional monstrosities known as revenants. They excelled at it until quiet PLANS and madness tore open a gate between dimensions and unleashed a tide of revenants. Amidst the slaughter, Ilin was dragged through to the other side of existence.
Jade followed.
She returned minutes later, years older, bent under the weight of her brother’s body..
Now Jade lives as a recluse, haunted by secrets, grief, and guilt. Utterly exhausted, all she wants to do is rest.
Except, a revenant speaks to her, an unnatural plague is spreading, and a friend speaks of an alien compulsion he doesn’t understand. One he must never explore, lest all that lies hidden drags him below.
Thus, the second PLAN has begun, and the madness that corrupted the first has worsened.

The threads of psychological revelation that permeate the action with intrigue and discovery make Stormflower a passionately involving saga. It is complex in its world-building, attractive in its main protagonist’s flaws and struggles, and hard to put down. —D. Donovan, Sr. Reviewer, Midwest Book Review