A long-range sequel to the four-volume Saga of Pliocene Exile, and bridge (""vinculum"") to forthcoming yarns about the Galactic Milieu, a psi-powered future galactic association of many races. In the 1940's, Rogi Remillard and his twin brother Don are born with various psi powers; Rogi becomes quite comfortable with his, but Doffs will eventually destroy him. A mysterious visitor, the ghost, prompts Rogi to train the even more psi-talented Dennis, Don's son (the ghost eventually turns out to be Marc Remillard, the evil super-psi of Exile part four). Dennis will grow up to command awesome powers and establish a psi research center at Dartmouth. Meanwhile, around the world, other psi-powered groups form independently. Some, like the Russians, resist governmental attempts to manipulate them; others become centers of supercriminal activity. What none of them knows is that aliens from the Galactic Milieu are hanging out in space awaiting the correct moment to declare themselves. After more than 500 pages of often tedious complications, the embattled good-guy super-psis unite to form a group mind intent on bringing peace on Earth--so down come the aliens to set everything straight. The first half of this sometimes imaginative but impossibly bloated yarn is reasonably taut and shapely, but thereafter the padding expands inexorably. The aliens are a joke (imagine Yalies with extra eyes, tentacles, mammaries, etc., trying to explain quantum chromodynamics while simultaneously gargling). Still, Exile was a similarly inflated mishmash, and readers lapped it up--so this one should prove popular too.