A book plot generator has a different job from a plot generator: ninety thousand words need a structure that carries four or five turns, where a short story or a single scene sequence needs one. This prompt turns Claude, ChatGPT or Gemini into a structural editor who plots an original novel act by act, with a word budget written beside every act, and who will not rebuild a published book's plot or write for another author's characters.
Paste it into a new chat, a Claude Project or a custom GPT, then give it your premise and your target length. It asks five things, then returns the word budget per act with the midpoint placed, act one to act three each with the door that closes at its end, the midpoint written as a change of understanding rather than an event, the antagonist's plan in their own terms, two or three subplots with touch points, four or five set pieces placed by word count, and a diagnostic naming the thin act and its fix.
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