In 1946, Peggy Carter is now a secretary for the Strategic Scientific Reserve. Howard Stark asks her for help when the country believes that he is selling deadly weapons to their enemies.

As Agent Carter closes in on Howard Stark's stolen technology, Peggy's secret mission could unravel when the SSR arrests Jarvis and a secret is revealed.

Peggy is cornered and more vulnerable than ever as Leviathan makes their move against her. As the SSR zeroes in on Howard Stark, they may pay the ultimate price as they find their true enemy is closer than they realized.

Peggy moves to the City of Angels to help Chief Daniel Sousa at the West Coast Strategic Scientific Reserve (SSR) investigate a bizarre homicide involving an alleged killer and Isodyne Energy, and reunites with some familiar faces.

Peggy discovers her murder investigation has huge ramifications that can destroy her career, as well as everyone near and dear to her.

As Jarvis' precision and quick-thinking skills are put to the ultimate test, Peggy must find a way to stop an atomic explosion that threatens to destroy all of California.

Peggy and Sousa propose a trade with Whitney Frost, while the SSR gets help from Howard Stark that may be the key to eliminating Zero Matter.

Peggy desperately tries to save Dr. Wilkes with a dangerous plan to stop Whitney Frost. But Thompson makes a surprising move that could destroy them all.

Peggy needs Howard Stark to eliminate Zero Matter as they are faced with a mission none of them could come back from.