What a restless person this Romka is! Who else would have had enough of the fame of a young detective, but he also wanted to try himself in the role of... a treasure hunter. True, his first find is not at all impressive - it’s just an old cigarette case made of not at all noble metal, but inside... Mysterious lines, circles, arrows are scratched inside! “But this shows where the real treasures are hidden!” - Romka exclaims and, without wasting time, gets down to business. Having identified the place shown on the plan, the novice treasure hunter begins his search - and it is here that the first and most detective mystery awaits him... Previously, the book was published under the title “The Case of the Lost Key”