It is based on the 1984 novel A Shock to the System by British author Simon Brett.
Klavan has also written supernatural thrillers such as Don't Say A Word (1991) — which was also nominated for an Edgar, The Animal Hour (1992), and Corruption (1993), and wrote the screenplay for the film version of Simon Brett's novel A Shock to the System.
A Shock to the System, 1990 film based on the novel, directed by Jan Egleson
He has also written several mystery plays and some non-series novels, of which A Shock to the System (1984) is probably best known due to the filmed version starring Michael Caine as the business executive who takes revenge after being passed over for promotion.
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