Salt is about CIA agent Evelyn Salt, played by Angelina Jolie, who's loyalty is questioned when a Russian informant identifies her as a double agent. Salt escapes and is on the run, all the while, its never clear where her loyalty lies.
The movie was originally scripted with a male lead and Tom Cruise was approached to play the title character. Ultimately, he backed out and the script was rewritten with a female lead and Angelina Jolie took the role.
As a CIA officer, Evelyn Sarlt swore an oath to duty, honor and country. Her loyalty will be tested when a defector accuses her of being a Russian spy. Salt goes on the run, using all her skills and years experience as a covert operative to elude capture. Salt's efforts to prover her innocence only serve to cast doubt on her motives, as the hunt to uncover the truth behind her identity continues and the question remains: "Who is Salt?"