Silkie

Silkie by Van Vogt, Alfred Elton. paperback edition. ISBN: 9780441765027.

"THE SILKIE" is a man-like being that can move through space, water, or on land with equal ease. "THE SILKIE" can think like a computer, and read minds. "THE SILKIE" can communicate etherically, or change form to suit changing circumstances. But are the Silkies all that is claimed? Are they trulty mans creations and servants - or are they a super-race of scouts controlled by anti-human aliens? The Silkies themselves do not know