Novel, first published: Putnam 1967
In the world of 2487 A.D. bioengineers have developed androids who can change into alien species, take up the life of an alien creature and then revelt back to human form. Andrew Blake, one of these experimental androids, assumed two such alien forms, complete with alien intellect and alien emotions. One is called Thinker, a logical mind in pyramidal shape that feeds on pure energy; the other is Quester, a telepath in wolf shape who can receive pictures sent out by alien intelligences. But something goes wrong and Blake's mind is not wiped clean of each alien presence. Blake, called Changer by the other two, has become a trinity of multiple beings all occupying the same body simultaneously, capable of changing into three different bodies at will.
When Blake is found frozen in a space capsule orbiting an asteroid in the Antares star system, his memory is blank except for general information about Earth two hundred years ago. Blake, searching for his identity, is helped by the telepathic Brownies, migrant alien psychologists who have been studying Earth for ages, and by a senator, a proponent of bioengineering for space colonization. Believing himself human, Blake falls in love with the senator's daughter, Elaine.
When Blake finally realizes who he is, he follows a message to Willow Grove, and the sight of the town jogs his memory. He remembers that his mind is that of a real human being, physicist Teddy Roberts, impressed upon his synthetic brain. Pursued by the humans who think he is a werewolf, Blake is depressed by his alienness. He is a monster, a freak, yet part of him longs for human love.
Blake remains in the Willow Grove cemetery chapel for a year, in the shape of Thinker who begin collecting data to solve the riddle of the Universe. Blake becomes both an object of curiosity and a Messiah to a religious cult. Changer finally returns against the wishes of the other two, which pinpoints his identity crisis: even if he wanted to remain human, does he have the right because of the other two?
With the help of the Brownies, Earth proposes a solution to the problem of Blake. He will be sent out on a quest, an immortal body in an immortal ship, to put his triple being and tripled special powers to work seeking out the mind that "operates the Universe - that pushes all the necessary buttons." Rejected by humanity, the embittered Blake takes off. In space, Elaine appears and reveals her real identity - she was another android given to the grief-stricken senator when his real daughter committed Suicide. Blake was duped into leaving, thinking there was nothing left for him on Earth, for he and Elaine are "really extensions of humanity, the hand and mind of mankind reaching out into the mysteries of all eternity." (Chapter 35)
Ewald, Robert J.: When the Fires Burn High and the Wind is from the North, p.89-91