Jeremy and Lillian are twins, Mezna/Human hybrids born on the wrong side of the sector border. They have passed for human and hidden their identities their entire lives, but when Lillian develops a mysterious ailment, how can Jeremy get her help without exposing who they really are?
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Fifty years ago the Mezna arrived with a promise to save humanity from itself. Now Earth has divided into three factions: those who welcome the Mezna, live in Mezna-built terraformed cities, and raise children with alien DNA included with their human genome; those who rebuke all alien interference and live in Human Only sectors; and those who fall between the two, fighting for survival on a planet no longer suited for their way of life.