Robert Silverberg,
The mystery of Deneb IV
(1956)
“ Carter stared down at the horror in the pit. Again the wave of thought rolled up. I am your master, strange one.The force of the thing's mind overwhelmed him; he rocked dizzily, but kept his balance. Now, he knew what had happened, why Gendron had behaved as he did.The Vanguard had landed on unexplored Deneb IV, and the minds of its crew of twelve had been snared by the Khethlani. It had turned them into so many puppets. ”
