Extro aka Computer Connection Alfred Bester HC Readers Union Book Club UK 1976

Scattered over the densely populated solar system there is a small group of Immortals. One of them, Dr Sequoya Guess, attempts to take over Extro, the supercomputer complex that controls all mechanical activity on Earth. But instead Extro takes over Guess, and the combination turns suddenly evil. Dr Guess must be destroyed—but how do you kill an Immortal?

Eagerly awaited for nineteen years, Alfred Bester\'s new SF novel. A secret society of Immortals... A supercomputer gone bad—there\'s no stopping this dazzling, exhilarating roller-coaster ride through the fantastic future of Alfred Bester\'s imagination!