The Prodigal Sun Author:Philip E. High Foster child of the Mattrain - planet of supermen - Duncan returned to Earth, his birthplace, only to meet suspicion, hostility and hatred. To Duncan this reception was not unexpected. He had come, not for pleasure, but for a purpose - his was a mission on whose success hinged the existence of the whole human race.
Typical mid-60s SF - themes of freedom vs mind control & brainwashing, personal responsibility vs governmental control, man and woman finding THE ONE that completes them, the hero larger than life with vulnerable moments... Since it's the 60s and not the 50s the heroine is a scientist rather than a secretary but still needs to be rescued by the hero.
It's nice to read the occasional book done in black-and-white rather than endless shades of gray.