The Lost Planet

When an alien armada invades the Terran Republic, the fate of humanity depends on two young people: Glen, who doesn't know how to be human, and Elise, who has never been on her own.
Starship pilot Glen Susa knows only the life of a slave. Forced into a life of crime by his alien master, Glen dreams of freedom, of fleeing the Regency, and of meeting a human girl. When he learns of the impending invasion, Glen breaks the chains of slavery and flies off to warn humanity.
Elise Rollins dreams of a normal life. Instead, she assists her father with his research into the fate of the long-vanished Progenitors, founders of the Regency. When her father discovers evidence of the invasion, Elise goes on the run to warn her people.
Chance brings Glen and Elise together, but their warnings come too late. Certain that the Terran Republic cannot defeat the armada, they set themselves a daunting task-solve the millennia-old mystery of the Progenitor's disappearance and discover their lost homeworld...
Can Glen and Elise do the impossible before the Regency enslaves humanity?
If you love taut intrigue, unique alien cultures, and hair's breadth escapes, you'll love Henry Vogel's modern take on the golden age of space opera.