Starting off a grocer, Ira Howard became rich as a
sutler wholesaler during the
American Civil War, but died of old age at 48 or 49 years old. The trustees of his will carried out his wishes to prolong human life by financially encouraging those with long-lived grandparents to marry each other and have children. By the 22nd century, the "Howard families" have a life expectancy exceeding 150 years and keep their existence secret with the "Masquerade" in which the members fake their deaths and obtain new identities. The Masquerade helped the Families survive the dictatorship of
Nehemiah Scudder, but as an experiment, some Howard members reveal themselves to The Covenant, hoping that the free society established after Scudder's defeat will be friendly. They are mistaken; others refuse to believe that the Families obtained their lifespan by
selective breeding, insisting that they have developed a secret method to extend life. Administrator Slayton Ford, leader of Earth, believes that the Families are telling the truth, but cannot prevent efforts to force Howard members to reveal their alleged rejuvenation treatments.
Lazarus Long, the eldest member of the Families, proposes that the Families hijack the colony starship
New Frontiers to escape Earth. Using an
inertialess drive invented by Howard member
Andrew Jackson "Slipstick" Libby, the Families leave the Solar System with the deposed Ford. The first planet they discover has humanoid inhabitants
domesticated by undescribed godlike natives. When Earthly humans prove resistant to similar domestication, they are expelled from the planet. The second planet is a lush environment with no predators and mild weather. Its inhabitants, the “Little People”, are part of a
group mind, with the mental ability to manipulate the environment on the genetic and molecular level, but do not distinguish between individuals. That becomes evident when Mary Sperling, the second oldest member of the Families, joins the group mind to become immortal. The Families are further horrified when the group mind genetically modifies the first baby born on the planet into a new, alien form. A majority of the Families want to return to Earth to demand their freedom; Libby, with the help of the group mind, builds a new
faster-than-light drive to take them home in months instead of years. The Families, returning to the
Solar System 74 years after their original departure because of
time dilation, discover that Earth's scientists have artificially extended human lifespan indefinitely by replicating what they believe is the Families' secret. The Howard members are now welcomed for their discovery of travel faster than light. Libby and Long decide to recruit other members of the Families and explore space with the new drive. ==Critical reception==