Under Alien Stars — Pamela F. Service

Ten years ago, the Earth was conquered by the Tsorians. The Tsorians used the Earth as a military base, allowing life to go on much as before. But some could not stomach the idea of living under alien rule, however benevolent. These were the Resisters, whose purpose was to sabotage the Tsorians any way they could.

Jason Sikes dreamed of becoming a Resister -- even though his mother worked side by side with the hated Tsorians. Aryl, as daughter of a Tsorian commander, couldn't understand how her father could work with primitive beings like Earthlings.

But dangerous forces were at work, and soon Jason and Aryl would be forced to put their hatred aside and become partners on an impossible mission, fighting a foe that threatened Tsorian and Earthling alike!