Five months later. Sydney quits the CIA and joins a Black Ops unit called "Authorized Personnel Only" alongside Dixon, Jack, Vaughn and... Sloane whom for limited immunity is co-operating with the APO. Meanwhile, the truth Sydney found out in Wittenberg endangers her relationship with Jack, and eventually she reveals the awful truth to Vaughn: about her father having Irina murdered over a year earlier.

《双面女间谍 第四季》是一部都市青春剧，剧情以甜宠为主，人设不浮夸，该剧既有青春岁月的美好回忆，也给观众带来更深的青春共鸣，除了精彩剧情之外，华丽的场景、精致的服装、娴熟的拍摄手法、精美的画面都是该剧的制胜法宝。。