Cosykiller — for the armchair sleuth
The Cosykiller Pocket Guide to Cipher Solving lying on a desk

The cipher guide Paperback · pocket-sized

Pocket guide to
Cipher Solving.

Grab a copy of our amazing pocket guide to cipher solving!

Just £10
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Front cover of the Cosykiller Pocket Guide to Cipher Solving

Pocket guide For the amateur sleuth

A codebook no serious sleuth would be without.

(Well, we say pocket… you'd need pretty big pockets, but then you'd have those as a spy right?)

This little book is an amateur's guide to code breaking and ciphers and it's designed for the amateur sleuth. It includes a super few cheat sheets of common letter substitution alphabets and guides to cracking some fiendish ciphers. This is one codebook no serious sleuth would be without.

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A look inside

What you'll find on the pages.

Cheat sheets for common substitution alphabets, primers on the harder ciphers, and the worked examples that get you from "I have no idea" to "oh, I see."

  • Inside the Pocket Guide to Cipher Solving — example page
  • Inside the Pocket Guide to Cipher Solving — example page
  • Inside the Pocket Guide to Cipher Solving — example page
  • Inside the Pocket Guide to Cipher Solving — example page
  • Inside the Pocket Guide to Cipher Solving — example page
  • Inside the Pocket Guide to Cipher Solving — example page
Back cover of the Cosykiller Pocket Guide to Cipher Solving

Why we made it

For the sleuth who wants the techniques in one place.

Every Cosykiller case teaches the techniques you need inside the box. The pocket guide brings them together in one volume — handy for cross-referencing across cases, and a useful first read if you're new to ciphers and want to feel ready before you open your first case file.