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Jennifer Smythe escapes Earth's invasion by the insidious Kasari race, hijacks an alien starship, and survives the deadly passage through a wormhole.

But escape is short-lived...

When Jennifer emerges on the new world of Scion, she is confronted by the same deadly enemy. Now the Kasari have sided with the planet's angel-like elite against the warrior underclass, but with the intent of ultimately ruling both. And when Jennifer is captured by the brutish Koranthians, her alien-enhanced abilities make her a crucial asset in battling the Kasari and their winged allies.

Back on a divided Earth, Jennifer's brother, Mark, and Jack "The Ripper" Gregory wage their own war against the Kasari. As the global government welcomes the extraterrestrials, Mark, Jack, and their rebel faction seek to use the powerful mind-altering skills gained from the Kasari's sworn enemies to repel the would-be conquerors. But faced with the might of Earth's ruling forces, has the cause already been lost?

When Mark and Heather Smythe saved Earth from the conquest-hungry Kasari Collective, they thought their work was done. But the world's vast new government continued its quest to make extraterrestrial contact. And now, as a new gateway is activated to welcome the Kasari, whom world leaders take to be benefactors, only the Smythes stand a chance of countering their planet's invasion and subjugation by a race of ruthless conquerors.

Years after their failed first mission, the Kasari have returned, bearing irresistible promises while concealing insidious plans to enslave humanity. But not if the Smythes--along with fearless CIA agent turned mercenary Jack Gregory and his partner, Janet Price--can help it. From the world's last stronghold, they take the fight to enemies both earthling and alien--even as their comrades-in-arms join the warrior Koranthians in battling the Kasari on a far-off planet. But the greatest danger lies within Earth itself, where an ancient artifact prepares to summon doom from another world.

In their battle to save Earth from becoming another conquest of the alien Kasari Collective, Mark and Heather Smythe have struck crucial blows against the enemy. But their best efforts have still failed to derail the completion of the wormhole gateway that would give the insidious extraterrestrial invaders access to the planet--and doom humankind as helpless slaves of the Kasari hive mind.

The Smythes and their intrepid allies--including the mentally altered humans, The Enhanced--stand ready to beat back the Kasari onslaught once and for all. Not by mortal combat, but with scientific cunning. Still, the success of their plan depends on a daring stealth mission into the heart of the aliens' nerve center on Earth. And multiple threats lie in wait--including the ruthless Kasari commander, a brutal double agent with a deadly vendetta to settle, and the alien entity Khal Teth, who wears a human face but is ready to strike with monstrous force.

In this stunning conclusion to the Rho Agenda Assimilation by the bestselling author of The Second Ship, the small but fierce band of altered humans and Earth's resistance fighters face their greatest opportunity to stop the Kasari. But with the remnants of humanity and a battered Earth caught in the cross fire, can they secure a victory without sacrificing everything they're trying to protect?