Monthly Membership: US ($11/month)

A monthly case file on the world's greatest unsolved mysteries, now fully interactive.

Every month a sealed file lands in your mailbox, built around one unsolved case. Inside: a researched newspaper that tells the whole story, a Field Kit puzzle you crack by hand with nothing but a pencil, a collector card, and original stickers. Hidden in every file is one fragment of a cipher that runs all year. Collect all twelve, assemble the code, and unlock a members reward when you renew. The archive stays open.

$11 a month, postage included, cancel anytime. For members in the United States. No shipping fees at checkout.

New here? Spin the wheel on the site for a discount on your first file.