Hotch's Niece | Criminal Minds

AU-ish. Avery Hotchner is Aaron Hotchner's 18 year old genius niece. When her parents (Hotch's brother and sister in law) are killed, Avery decides to leave college and take Hotch's long-standing offer to be a part of the BAU. Taking the job means gaining new family members- the rest of the team. Slowly, Avery learns...