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Firefly & Fern is an independent platform. We are not affiliated with any publisher. We use affiliate links — when you buy through our links, we may earn a small commission at no extra cost to you.

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unsolved puzzles

Books about unsolved puzzles for readers of all ages.

What Do We Know about the Mystery of D. B. Cooper?

Kirsten Anderson, Who HQ, Tim Foley

Ages 8–12mysteryhistory