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Crack intercepted letters. Uncover a mystery, one cipher at a time.
A ledger. A missing bookkeeper. A code only you can crack. An estate-sale find hides more than old receipts tucked into its spine is a coded note, and cracking it is only the beginning. Cipher Notebook is a cozy mystery told entirely in code. Each intercepted letter hides a piece of the story: a bookkeeper who vanished decades ago after finding something in the books that was never meant to be found. Crack the cipher, read what she left behind, and follow the trail one solved message at a time. HOW IT WORKS Every note comes with one worked clue a single word already decoded to get you started. Use it to crack the substitution, place letters into the message, and watch it reveal itself in real time. Get three letters wrong and the note resets, so read carefully before you commit. A STORY TOLD IN CODE No two notes are decoded the same way. Every chapter is a new case file a fresh cipher, a fresh clue, and a fresh piece of a mystery that spans a missing person, a fraud that was never solved, and a name that keeps showing up where it shouldn't. DESIGNED TO FEEL LIKE THE REAL THING Worn manila folders. Coffee-ringed ledger pages. Every note looks and feels like something you're not supposed to be reading because you're not. No timers. No pressure. Just you, a pencil-and-paper puzzle, and a case that's waited a long time to be solved.