Blackcollar: The Judas Solution - Timothy Zahn - Bog

Blackcollars - superhuman resistance fighters dosed with the legendary, lost drug backlash. Only a dying generation stands between humanity and hopeless enslavement by an alien empire. But now the blackcollars' daring is matched by a cunning human enemy - mind-slave to the Ryq - who is determined to sow betrayal in their midst.