What is the fine-grained topic of the following text: “The Enemy Within” (10 p.m., NBC): Flashbacks to the past reveal the fateful events that led CIA Deputy Director Erica Shepherd to betray her country and the ensuing investigation that put her on a collision course with Will Keaton. Only return the topic.
The past events leading to CIA Deputy Director Erica Shepherd's betrayal of her country and the ensuing investigation involving Will Keaton.