Secret Avengers #19

"ANIANA" Run the mission.  Don't get seen.  Save the world.  In the decadent and crumbling city of Aniana, in the Eastern European country of Symkaria, a local drug lord is planning to sell something mysterious to the Shadow Council.  The Avengers cannot risk that, or an interception after the fact -- they must get to the drug lord before the handover, and take whatever the goods are.  Their covert mission uncovers something utterly unexpected, ancient and terrible and a threat to the entire world...