"Secret Window, Secret Garden" is a psychological thriller novella by Stephen King. Mort Rainey, a successful writer, is going through a bitter divorce after catching his wife Amy in an affair. His fragile peace is shattered when a sinister stranger named John Shooter appears at his door, accusing Mort of plagiarizing his story. Mort insists on his innocence but cannot find proof. As Shooter's demands turn increasingly violent—burning evidence and leaving death in his wake—a horrifying truth emerges: Shooter does not exist. He is a murderous split personality born from Mort's fractured mind, embodying the darkness that demands a deadly "ending."