Paul Macy wears the Rehab badge, the sign of healing that advertises his status as a reconstruct job. When society derides capital punishment and opts, instead, for personality rehabilitation, criminals undergo mindpick operations in which their identities are stripped and extinguished. Given a new bank of memories and a fresh identity, they are offered a second chance at life. For Paul, though, this gift comes without a price. His former self still lingers inside him, waiting for the opportunity to emerge and battle Paul’s new self for ultimate control.

Abner Harris was sent to Earth on a mission of extreme urgency. The universe was in danger of enslavement by the Medlins, and the fight against them called for Harris to assume the disguise of a flesh-and-blood Earthman.But he discovered that the real villains of space were not the Medlins or the people of Earth: they were his own kind.Suddenly he was alone, alienated from his own race, hated by the Medlins, and an impostor on Earth. No matter what side he chose he’d be a traitor.Yet choose he must… or forever remain a man without a planet.

In a not-too-distant future, the assassination of an all-powerful New York City Mayor has plunged the five boroughs back into a dangerous cesspool of crime, drugs, and prostitution. Professional prognosticator Lew Nichols joins the campaign team of a fast-rising politico running for the city's top office, and is introduced to a man who privately admits to being able to view glimpses of the future. Lew becomes obsessed with capturing the man's gift and putting it to use for his candidate, but struggles to accept the strict terms he arranges with his mentor… and the unforgiving predetermination of the future.Nominated for Nebula Award for Best Novel in 1975.Nominated for Hugo Award for Best Novel, Locus Award for Best SF Novel, and John W. Campbell Memorial Award in 1976.

They were disappearing, one at a time, in spite of the fact that in the crowded, hungry world of 2490 there was really nowhere worth going. Then they began to reappear, not in Moscow or Nairobi or L.A.—but in 1970, 1981, even the nostalgic days of the roaring 2100’s. A way to the past had been found and people were flocking through it for a better life—no matter what peril they might pose to the threatened present.Earth in the late 25th Century is an unpleasant place for many. People are crowded into most available areas. Unemployment is rampant. A highly stratified society provides luxury & space for a few, while lower levels live crowded in tiny apartments. Into this situation comes a hope of escape—escape into the past, before the world was crowded.The story follows several characters. 1st is Joe Quellen, a midlevel Secretariat of Crime bureaucrat with a secret African residence, reached by a private teleportation booth. He heads the investigation into unauthorized time travel. Another is Norman Pomrath, Joe's brother-in-law, an unemployed low-level worker. He swears he wouldn't abandon his wife & children if presented with a chance to become a hopper.