The Last Green Beret

All humans produce ''Auras''...they just think they are reading the Body Language of each other. Their Auras are Clear but there are several groups that have evolved past that. ''Reds'' can see enough of an Aura to know if someone is lying or about to cause trouble. Yellows in just a few words can make you feel wonderful about yourself. Blues are able to Mindwalk and can examine your memories even while you sleep. These ''colors'' normally keep to themselves and didn''t notice when the Greens all disappeared. But now...a Green has been found...and is imprisoned. If someone has figured out how to detect the Aura of a Green then everyone is in danger. Not only must he be rescued but they must discover how he was trapped and try to prevent them all from becoming prisoners.