Brain Twister

Brain Twister, originally published as That Sweet Little Old Lady in 1960, is a science fiction novella by Randall Garrett and Laurence M. Janifer, writing under the pen name Mark Phillips. The story follows FBI agent Kenneth J. Malone as he investigates a telepathic spy, posing the challenge of locating a telepath to apprehend another. The novella was nominated for the Hugo Award, highlighting its significance in the genre.