Dropping Eaves

Overview
Summary:
 * 1) Find the White Mantle meeting spot and eavesdrop on their conversation.
 * 2) Return to Deep Root and tell him what you have overheard.

Obtained from:
 * Deep Root in Ettin's Back (right in front of Ventari's Refuge)

Requirements:
 * None

Reward:
 * 500 XP
 * Skills
 * Warrior: Shield Stance
 * Ranger: Predatory Season
 * Monk: Rebirth
 * Necromancer: Death Nova
 * Mesmer: Spirit of Failure
 * Elementalist: Iron Mist

Dialogue
 * "Whispers in the earth have pointed to two White Mantle agents at work in Reed Bog. They attempt to move through the area with stealth. I would like to know their purpose in coming here. See if you can find them and overhear their conversation. You may do what you like with them, but make sure you obtain some information from them about their plans."

Reward Dialogue
 * "Your eavesdropping has brought us valuable information. It would seem we have a traitor in our midst.  Who among the Shining Blade would stoop so low as to betray his brothers and sisters?  We shall remain silent on this matter for now.  I must think on how to flush this traitor out."

Followup: 
 * Blood and Smoke

Walkthrough
Head south, then west until you get to Reed Bog. Once there, continue west until you come to a gathering of White Mantle. When you approach the two White Mantle, just wait before they reach your danger radius. They'll have a short chat and walk away, when they've finished you can head back to Deep Root.