Fear Itself: Black Widow (2011) #1

FEAR ITSELF TIE-IN! Russia's deadliest assassin! France's most iconic city! As fear ravages the streets of Paris, a group of diabolical extremists plot an act of mass terrorism. In order to avert nuclear disaster, The Black Widow must brave a city in chaos, face down a crack team of deadly mercenaries, and infiltrate a well-protected government facility. She's on her own... which is just the way she likes it.