From the back cover:
The Diamond Staff of Chomylla, an artifact with the power to unlock the mysteries of an ancient elven civilization, has at long last been found. When orcs steal the staff, though, it's up to a group of heroes to stop them. Why orcs would want the staff is anyone's guess, and the quest to find the truth might well lead the adventurers across the Dalelands and into the depths of the lost library vaults of Uvaeren.
Search for the Diamond Staff is a Dungeons & Dragons Roleplaying Game adventure designed for the June and July 2013 season of the D&D Encounters official play program. The adventure comes with two full-color battle maps, eight ready-to-play encounters and information the D&D Encounters program.
See also D&D Next Conversion Notes: Search for the Diamond Staff