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The hunter-green box sat tucked among books in the antique store, a mystery hiding in plain sight. One word on the spine caught my eye: puzzle.

As an author and a voracious reader, I’m naturally drawn to the book section of any store, my neck bent as I peruse the selection. But I’m also a puzzle person. Every Christmas, Mom and I try to beat our personal record of puzzles completed. Movies play in the background while we s...