This quest is not available in game.
Steal 5 Soul Devices and deliver them to Spymistress Mehlisah Highcrown at the Terrace of the Light in Shattrath City.
Gah! They've been torturing me, trying to get me to tell them everything that I know.
I failed - they fed the others to Hellmaw, and I was to be next. But I told them nothing!
They're crazy! They're hell-bent on summoning demonic forces that they have no way of controlling!
They're using special devices to make their soul shards, and their summoning, more powerful. You must steal these devices!
I would join you, but I must return to Shattrath City to report to the Lower City's spymistress.