A Trilogy collection of Bob Shaw's Orbitsville.
Orbitsville
When the young son of Elizabeth Lindstrom, the autocratic president of Starflight, falls to his death, Vance Garamond, a flickerwing commander, is the obvious target for Elizabeth's grief and anger. Which, since Elizabeth is not a forgiving employer, leaves Garamond little choice but to flee. And fleeing Elizabeth's wrath means leaving the Solar System far behind, for ever, and hiding somewhere in deep space. Pursued remorselessly by Earth's space fleet, the somewhere that Garamond finds is an unimaginably vast, alien-built, spherical structure which could just change the destiny of the human race...
Orbitsville Departure
Two hundred years ago mankind found Orbitsville, a vast sphere whose habitable inner surface comprised living space equivalent to five billion Earths. The resulting migration was enthusiastic - and nearly total. Earth itself is a backwater now, a place with which the people of Orbitsville maintain only marginal contact. But just because it's backward doesn't mean it isn't dangerous.
Orbitsville Judgement
Orbitsville - scene of two of Bob Shaw's novels - is a vast hollow world completely enclosing its sun and habitable across its entire inner surface. At the end of "Orbitsville Departure", the whole world was shifted to an alternate universe and this book tells what happens next.
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