The Andromeda Exodus

In 2169, two intelligent lifeforms inhabit the moon, Titan. Only one will rule the galaxy.Another army is on its way. This one's from Earth, they can't be stopped, and all humans in Saturnian space are destined for repatriation camps in the asteroid belt.This is what the alien leader is counting on. They plan to infect the invading army and reproduce geometrically when the army returns to Earth. Human bodies will exist, humans will not.Returning to Earth for Pati Lynch is now a moot point. If she doesn't stop the aliens, and the invading army, she and all she loves will be extinguished. Her only option is to deal with the alien in Harry Meldrom, and hope it's not playing her for its own gains.