The widow of the author of the novel, "The Amityville Horror" is suing Harvey Weinstein, Bob Weinstein and TWC, for allegedly ripping off her dead husband's work by creating a 2017 sequel.

Lesia Anson says the sequel is derived directly from her husband's novel and the 1979 film, both of which her husband created. She says the 2017 sequel -- "Amityville: The Awakening" is "a cinematic mess and received dreadful reviews." She goes on to say it suffered one of the worst opening weekends of all times, grossing $742 from 10 theaters.

She says TWC never even approached her for permission ... they just ripped her off.