A slick, tame sequel that extensively recaps and updates the original 2001—but betters it only in the nuts-and-bolts department. The derelict ship Discovery, with disconnected computer Hal aboard, is in a decaying orbit about Jupiter; joining a USSR/US investigatory mission are, familiar from 2001, project expert Heywood Floyd and Hal's creator, Dr. Chandra. But then, surprisingly, a Chinese ship rockets past them and lands on Europa to refuel—only to be engulfed by a plant-monster inhabiting the liquid water beneath the moon's icy jacket. And soon Discovery is operational again: Hal, his murderous memories deleted by Chandra, wakes up sane enough; of missing astronaut Bowman there's no trace; and the Star Gate (the enigmatic floating slab beyond which lurk the mysterious cosmic beings who are directing human evolution) proves impervious to analysis. Then Bowman himself, now the god-like Star Child, bursts from the Gate and heads for Earth: he is, however, still being studied by, and controlled by, the cosmic paladins who transformed him into a disembodied intelligence (where he's low man on the totem of galactic brainpower). So the Star Child pokes about Bowman's old haunts on Earth, then surveys the Jovian system—where he realizes what his masters intend and warns Floyd to leave. And, in the finale, the cosmic brains ignite Jupiter into a mini-sun, thus warming up the Jovian moons to provide the struggling Europans with a more congenial environment in which to evolve intelligence. Steady cosmic storytelling, then, short on drama but delivered with Clarke's usual boyish panache; and the many 2001 followers will regard it as compulsory reading.