The colony worlds of Adirondack and Silvern fell to the Troft forces almost without a struggle. Outnumbered and on the defensive, Earth made a desperate decision – it would attack the aliens not from space, but on the ground – with forces the Trofts would never suspect…And so the cobras were created – a guerilla force whose weapons were surgically implanted, invisible to the unsuspecting eye yet undeniably deadly.  But power brings temptation – not all the Cobras could be trusted to fight for Earth alone…