The Seventh Hypothesis (French: La Septième Hypothèse) is a 1991 book by Paul Halter.
In 2014, The Guardian's Adrian McKinty considered The Seventh Hypothesis the third best locked-room mystery.
[1] One plot point turns on the revelation that a Mechanical Turk chess automaton was operated by a person inside the machine, reflecting a recurring theme in Halter's books that technology might allow seemingly-supernatural events to be real.
You can help Wikipedia by expanding it.See guidelines for writing about novels.
Further suggestions might be found on the article's talk page.