Puzzle 15

and the disappearance of Marilyn Bergeron

Have you heard of Puzzle 15?

I bet you have, you just don't know it. You know those 4 x 4 tile scrambles where you have to rearrange the sliding pieces into an image? Popeye? The Flinstones? That's the 15 puzzle, sometimes called Gem, Boss, or Mystic Square.

The 15 puzzle

The 15 puzzle was the original fidget spinner occupying busy digits a century before …