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My feeling is that you should hint at it, so that it doesn't feel like a deus ex machina, but write your story and show it to some beta readers asking about that in particular. If you hint too stro...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/24372 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/24372 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
My feeling is that you should hint at it, so that it doesn't feel like a deus ex machina, but write your story and show it to some beta readers asking about that in particular. If you hint too strongly, it becomes obvious, but if you don't mention anything about this drug until the protagonist receives it, it shatters the suspension of disbelief.