Chicago's Secret

5 years. It has been 5 years since Chicago's Intelligence Unit lost their finest cop. She was smart, talented, and loved. Erin Lindsay didn't have much of a choice when leaving Chicago. This was her home, she had the first father figure, she had a stable group of friends, a stable job, but most importantly, she had Jay Halstead, the love of her life. He tried to call her, but she declined all the calls, changed her number, and moved to New York. She got Voight to pull some strings to work with the FBI. Little did she know, she was pregnant, and it could only be one person's. What happens when Erin must come back to Chicago and face her old life?