METHUSELAH'S CHILDREN

Through carefully controlled inbreeding, some 100,000 members of the Howard Families have achieved a life expectancy twice that of ordinary men and women- and this, when revealed, earns them the envy and enmity of the shorter-lived. Escaping, en masse in a space ship, they travel from one planet to another but cannot find another home until their final return to earth.... A genetic gambit- and inventive.