Golden Globe Award-winning actress Jennifer Garner is Sydney Bristow. Syd's not exactly your average grad student. Her life might appear normal, but she's hiding a secret life working as a spy for the CIA.
Sydney's world is turned upside down when she learns she may work for the very enemy she thought she was fighting. Now she's entangled in a covert lifestyle where she is forced to question the allegiances of everyone, including those closest to her.