The Scythian Crisis - J J Green - Bog

Humanity’s last stand
An attack by unknown aliens has devastated the Nova Fortuna colony. Its long-term survival seems impossible. But the colonists aren’t going down without a fight.
Ethan must prepare the Gens for their final battle. Geneticist Cariad must decide whether to reactivate the sinister Guardians to aid in the colony’s defense.
Earth is lost. The new world settlers are without hope. When the moment to decide humanity’s fate arrives, will they be ready?
The Scythian Crisis is book three in the compelling, provocative space colonization epic adventure, Space Colony One.