STEEL HEARTS
Book One — The Behind-the-Door Project
Some doors should never be opened.
When Earth is attacked by alien forces, pilot Allie Green and her team are chosen for a secret experiment: Project Behind the Door.
It does not save them.
It rebuilds them.
Transformed into powerful Steelborn warriors, they become humanity’s last defense. But when an ancient machine creates Astra—a child of steel with impossible power—every enemy wants her.
Now Allie must protect Astra and uncover the truth behind the Steelborn before humanity’s final weapon becomes its greatest threat.
The Second Dawn is coming. And Earth’s monsters may be its only hope.
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