Creative — lost at sea
Someone is lost at sea and suspects that one of the other few remaining survivors may have caused the horrible accident. They are stranded on a beach and much of their crew-mates are missing. What happens next?
The prompt hands you suspicion, which is more useful than it looks: suspicion gives a narrator a reason to watch, and a watching narrator produces detail. The trap is scale. Eleven survivors and a shipwreck is a novel; one suspect, one beach and one conversation held back too long is a story that closes in twenty minutes.