Roughly the first half of this book -- the one that demands the most application -- is the work of biologist Hardy and an investigator Harvie who did not put much stock let alone faith in Rhine's ""card-guessing procedures"" (Koestler does) and devised their own more extensive experiment fully described and evaluated here. Even if the evidence of telepathy was fractional, still there were less specific indications of more than coincidence. In the second and more seductive part of the book, Koestler, long a sponsor of those unverifiable but demonstrable phenomena, talks anecdotally about ""library angels"" and unlikely encounters and poltergeists before going on to relate parapsychology and quantum physics in the fashion, procrustean some thought, that he did in The Roots of Coincidence (1972). In toto, the book ranges from tabulated data to more esoteric and deeply mystical conjectures and perhaps ""telepathy, clairvoyance, precognition, psychokinesis and meaningful coincidences are merely different manifestations, under different conditions of the same universal principle."" This comes closer to substantiating that perhaps in a world where only hypnotism has had scientific acceptance.