Fireplace Hidden Door, Hidden Treasure, but also a trap

A detective movie or episode where there was a cryptic phrase that once understood opened a hidden door in a fireplace.  Once going thru the door, if you did not prevent the door from closing, the person was trapped.  The detective was trapped with another person, and they also found a previous person that was trapped and had died.  The hidden passage contained a valuable treasure, which was what they were looking for.  Eventually the detective and the person was saved.

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