What's the Name of That Book??? discussion

This topic is about
Murder on the Riviera Express
SOLVED: Children's/YA
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SOLVED. YA/ Adult Mystery. Solve It Yourself Train Murder mystery with clues. Correct solution is revealed at the back. Illustration/ blueprints of train car layouts & timelines. Set in Europe? 1920s-1950s? Small around 6" square. Read 1990s. [s]
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This is the article that came up and lists the books in the series:
https://www.paperbackdetectives.com/b...
EDIT: I missed that this one was published in 1999 so it's probably too recent but I'll leave it just in case
Mai's suggestion of Murder on the Riviera Express by Lagoon Books looks promising.
One copy on eBay shows a train layout/ schematic (with black background). It looks like the solution is printed upside-down (at the back). Scroll through the images - and hover/ mouse over to zoom in.
https://www.ebay.com/itm/224636309778...
Amazon says first edition is 1996. Size is 9.1" x 6.6" x 1.1".
Worldcat.org says it's 95 pages.
One copy on eBay shows a train layout/ schematic (with black background). It looks like the solution is printed upside-down (at the back). Scroll through the images - and hover/ mouse over to zoom in.
https://www.ebay.com/itm/224636309778...
Amazon says first edition is 1996. Size is 9.1" x 6.6" x 1.1".
Worldcat.org says it's 95 pages.
Books mentioned in this topic
Murder on the Riviera Express (other topics)Murder on the Riviera Express (other topics)
– smallish hardcover possibly was 6” square and ¼” thick/page count
– possibly maroon/dark red cover
– pretty sure the correct solution was in the back; may have had a red decoder plastic/acetate/film you placed over this text to actually see the solution (a very 80s/90s gimmick)
Any help tracking what this book or series of books was would be much appreciated!
-Adam