After being assigned to kill S.H.I.E.L.D. Agents Barton, Romanoff and Rogers, a young Russian Assassin is forced to make a decision, follow orders and take the lives of heroes or defect and face dangers she has never known before. One choice would bring guilt that would tear her apart. The other would open a whole new realm of possibility but hold the risk of death at every corner. One choice will define you. But it could also destroy you.