200 years ago, Thomas J. Beale hid a treasure and wrote a cipher that has been unbreakable until today…that is until Calla Cress starts to read it. Now, some

The lost city of Atlantis of the Sands: real or myth? Calla Cress is a top-notch spy for the International Security and Treaty Force (ISTF), but her latest miss

In Renaissance Venice, a manuscript in an unknown language was left in a confessional booth in Saint Marks’ Basillica. No one has cracked the code in centurie

The NSA, the British government, and a group of darknet hackers are after one of the most dangerous lists ever created—a list that, if it falls into the wrong