Secret Window (2004)

After catching his wife Amy having an affair with their friend Ted, mystery writer Mort Rainey retreats to his cabin at Tashmore Lake in upstate New York, while Amy stays in their marital home. Six months later, Mort, depressed and suffering from writer’s block, has delayed finalizing the divorce. One day, a drawling Mississippian caricature named John Shooter arrives at the cabin and accuses Mort of plagiarizing his short story, “Sowing Season”. Upon reading Shooter’s manuscript, Mort discovers it is virtually identical to his own story, “Secret Window”, except for the ending.

The following day, Mort, who once plagiarized another author’s story, tells Shooter that his story was published in a mystery magazine two years before Shooter’s, invalidating his plagiarism claim. Shooter demands proof and warns Mort against contacting the police. That night, Mort’s dog, Chico, is found dead outside the cabin, along with a note from Shooter giving Mort three days to provide proof. Mort reports the incident to Sheriff Newsome. Mort drives to his and Amy’s house intending to retrieve a copy of the magazine but leaves because Ted and Amy are there. Mort hires private investigator Ken Karsch, who stakes out the cabin and speaks to Tom Greenleaf, a local resident who may have seen Shooter and Mort talking together. At the cabin, Shooter demands that Mort revise his story’s ending to Shooter’s version, where the protagonist kills his wife.