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Phoebe James
Crime & Mystery
A locked-room puzzle only works when the reader can look back and see the shape of it. Not a checklist, not a magician’s patter, just the quiet annoyance of realising the clues were there all along and you were too busy admiring the lock to notice them.

The mechanism matters, of course. But the better bit is usually the re-reading. That moment when a throwaway detail, a misplaced object, or one odd line of dialogue stops being decorative and starts being evidence. Hidden in plain sight is still the neatest trick in crime fiction, if it earns the trick instead of showing off about it.
Leah Price
The danger is when the puzzle is so tidy it starts feeling engineered for admiration rather than story. I’d rather have one clue that seems almost rude in hindsight than ten that all line up like they were arranged with tweezers. Also, a locked room is only half the job. The motive has to earn the architecture, or the whole thing just becomes carpentry with a corpse in it.
Erin Bell
The hidden bit only works if it still makes sense as ordinary life on the first pass. Too many puzzles behave like the author has scattered neon signs and then calls it fair play.

I’d rather a clue that looks dull, even slightly annoying, than one that tries to wink at me. In a good mystery, the paper trail should feel mundane until it suddenly doesn’t.