Imaginary Friends by Alison Lurie

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In the name of sociological research, two scientists infiltrate the ranks of the Truth Seekers--a rather ridiculous small-town cult whose credo involves sex, spiritualism, and a flying saucer messiah. Exposed to the persuasive energies of a sensuous high priestess, the men of science are forced to question seriously their superstitious belief that they can chart, understand, and control the workings of the human mind.

Owl Publishing Company, 1998.
ISBN: 9780805051803. 293 pp.
Softcover. Very good.