Secret Window
Plot
After catching his wife Amy having an affair with their friend Ted, mystery writer Mort Rainey retreats to his cabin in upstate New York. Six months later, Mort, depressed and suffering from writer's block, has delayed finalizing the divorce.
Plot
A man 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 before Shooter's, invalidating his 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.
Plot
Mort reports the incident to Sheriff Newsome. Mort drives to his and Amy's house to retrieve a copy of the magazine, but he 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. At the cabin, Shooter appears and demands that Mort revise the ending of his story, giving it Shooter's twist, in which the protagonist kills his wife. When a fire destroys Amy and Mort's house, and presumably the magazine, Mort tells the police that he has an enemy.