"PROBLEM - to build a complete human consciousness out of computer hardware and desperation! By the author of DRAGON IN THE SEA and DUNE.
Soon after the start, they went mad. The three powerful, disembodied human brains that should have guided them for the 200-year journey to Tau Ceti. Could they manufacture a replacement before emerging from the Solar System into nothingness? Would the circuits reproduce the characteristics they needed, characteristics like conscience, love and guilt? Or would they end up with a zombie? A monster? A power-crazy fanatic? - or a genius? What they did build was fantastic, unguessable. Yet, looking back, it was always on the cards."