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》是一部甜蜜有趣的作品，设计很具有想象力，特效自然，画风使人心醉，该剧刻画了5个家庭和10余个主要人物，人物戏份平均，谁都不是绝对主角；情感浓度也很均匀，谁也不是人生输赢家。