Famous Murder Mystery by Agatha Christie turned into a play that is the king of Long-Runners and is squatting on rights to adapt the work to protect the twist at the end as a closely-guarded secret. And we're also not going to reveal it.
http://tvtropes.org/pmwiki/pmwiki.php/Laconic/TheMousetrap
FollowingLaconic / The Mousetrap
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