Stanley Weinbaum’s The Dark Other was first written sometime in the 1920s under the name The Mad Brain . The manuscript went unpublished until 1950, where it was posthumously released with edits by Forrest J. Ackerman.

Patricia Lane is a spirited young woman, in the midst of a passionate relationship with Nicholas Devine, a writer with a fascination with horror. When he starts to show bizarre personality shifts, she turns to her neighbor, a talented psychologist, to discover the source of these outbursts.