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A couple of other ideas that haven't been suggested yet: The protagonist gets lucky. He's off chasing an unrelated (or seemingly unrelated) lead or clue, and just happens to stumble across eviden...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/32615 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/32615 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
A couple of other ideas that haven't been suggested yet: - **The protagonist gets lucky.** He's off chasing an unrelated (or seemingly unrelated) lead or clue, and just happens to stumble across evidence of the impending delivery: financial records, an overheard mook conversation, or even the actual delivery preparations. - **Someone defects.** One of the villain's mooks decides he wants nothing more to do with whatever's going on, and tells the hero about it. - **Sabotage by another villain.** If this is a superhero comic with a rogues' gallery of different villains, Villain B might decide he doesn't like Villain A muscling in on his territory and rat him out to the hero.