The Ghost (a Avengers story)

Abigail Ghost is a feared assassin who is already working with the Avengers at the age of 13. But when she is called on a mission with all of the Avengers, something is bound to go wrong. But what can go wrong? Its just The Avengers on a stealth mission.

Takes place after Civil War and Tony and Steve are friends. And Thor and Hulk are on earth though you won't see much of them, though.