The series' main character, Daniel Meyer, who has recently been appointed as an investigator, arrives at the CIA residency in Berlin to uncover the source of a leak that supplies information to an informant. Under the guidance of seasoned veteran investigator Hector DeJean, a stubborn agent with a grim charm who reports to the residency chief Steven Frost, Daniel learns the rules of the game in the harsh world of professional agents, full of danger, betrayal, and moral compromises.