In "Dangerous," readers follow the story of Carson Jareau, who has fled her troubled past in Pennsylvania and seeks refuge with her sister JJ, a member of the FBI's Behavioral Analyst Unit. Carson is hesitant to disrupt JJ's life, but JJ assures her that the team will be there to support her. As Carson settles into her new life, she catches the eye of the team's chief, Aaron Hotchner. Hotchner is determined to keep Carson safe, even if it means putting his own life at risk. But when Carson's past catches up with her, the team must work together to protect her and solve the dangerous mystery of who is after her.