Imaginary friends - Alison Lurie

Roger and his all-time hero, Tom McMann, are about to infiltrate the Truth Seekers - a unique small-town cult whose credo involves sex, spiritualism and science fiction. Their flying saucer messiah is Ro, resident of the distant planet Varna, who sends his daily cosmic messages through Venea, a nubile teen-age psychic who lives with her Aunt Elsie in upstate New York. For Roger and McMann the experience is all a bit much, held spellbound by Verena's considerable charms and Ro's imminent trip to Earth, all sense of logic falls apart; and before they know it, the sanity of rational thought is enough to drive both of them out of their minds'