All the Colors of Darkness

An interesting melange of Sci-Fi and detective fiction set in the once futuristic time of 1986.
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He was their captive on the moon. Jan would have given anything to know whether those "faces" masked emotions of violence, contempt, murder - or worse - if this alien race had emotions at all!
His one chance at escape depended on knowing. And he had to escape - for if these creatures decided that the souls of earth were the wrong color, then they would destroy the world!