简要：Sydney woke up in Hong Kong with no memory of the past two years. She returned to Los Angeles, trying to piece together the last two years of her life, and discovered the fate of her friends and family: Vaughn thought Sydney had already passed away when he got married; Marshall is having a child with CIA technical expert Carrie Bowman; Dixon is now the new department head of the Los Angeles office of the Central Intelligence Agency. Sidney also learned about the shocking fate of Jack and Sloan; The former was detained by the Central Intelligence Agency for communicating with Irina, who is still hiding, while the latter was placed under house arrest in Switzerland for collaborating with the agency. Sydney obtained temporary permission from the Central Intelligence Agency in a case that may help her recover her memory, and she encountered a new enemy organization called The Covenant.
