Evelyn Salt, who is a CIA agent, has vowed to serve her best for her country. However, her loyalty was suspected when a traitor accuseed her as a secret agent of Russia. Salt had no choice and she must flee, she used all her skills and experiences of an agent to avoid being arrested. But her effort to prove her innocence only made people more suspicious. And, the chase to bring the truth about her still continues with a question: "Who is Salt?"