Plot Hole Checker — illustrative example

INPUT
The locked vault has one key, but a character enters without it or an explained alternative.

RESULT
Continuity gap: the entry scene conflicts with the established one-key access rule.
Possible repairs: establish another access route earlier, show the key changing hands, or revise the entry scene.
The supplied story does not establish which repair is intended; none is treated as an existing fact.

REVIEW
Look for missing causes and broken rules, not merely surprising events. A proposed fix should preserve the story's established constraints.

This is a teaching example, not a live execution record.