Like so many others before him, reluctant Sam MacGregor was sent on a pilgrimage for the Grail Vision by the Dancers: androids grown from the cells of one man, with the powers of hypnotism and illusion - androids who held the tribes of the Republic of California in thrall.

But soon Sam began to doubt his own identity, for he experienced, in close succession, extra-lives in different corridors of time and space.

And he count not know whom his search would destroy: the Dancers . . . or himself.