The Thinking Cap is a novelette written by Robert Bloch. It was first published in Other Worlds Science Stories, June 1953. It was reprinted in the 1963 collection Bogey Men, in the 1972 anthology Demon Lovers and Strange Seductions, edited by M. L. Carter, in the 1973 anthology Horror-Love, edited by Carter, and in the collections Final Reckonings in 1987 and The Complete Stories of Robert Bloch, Volume 1: Final Reckonings in 1990.
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