...a very particular treasure

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A player-created Guide is available for this content: On a Heist (Guide)

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From: A Prize Achieved!

Action Cost: 0

There, in a lockbox secluded in a cramped study just off an upstairs landing.

Unlocked with  is "The hiding-place of a precious treasure" (The shaded estate on Hemlock Row)

Redirects to:

A Treasure Uncovered