With no explanation, label text_A→text_B with either "DON'T KNOW", "NO" or "YES".
text_A: Toward the end of his life, Hitchcock was working on the script for a spy thriller, "The Short Night", collaborating with James Costigan, Ernest Lehman and David Freeman. Despite preliminary work, it was never filmed. Hitchcock's health was declining and he was worried about his wife, who had suffered a stroke. The screenplay was eventually published in Freeman's book "The Last Days of Alfred Hitchcock" (1999).
text_B: Can you buy the script to "The Short Night"?
YES.