Coded Message

Coded Message is dropped by Caden Shadowgaze at the Altar of Storms in the Blasted Lands.

It is also provided for Codebreaker.

The Uncrowned Shadow then pickpockets another one from a Suspicious City Guard in Stormwind City.

As a quest objective

 * Finishing the Job
 * Codebreaker
 * The Unseen Blade