The Backup Plan (Emily Prentiss's little sister)

26 year old Kathrine Anne Prentiss, a criminal justice major with three PHDs in linguistics, international relations, and international law, and a IQ of 168 gets a call from her older sister Emily Prentiss asking Kat to come be backup on a case the BAU was called on... little does Kat know that she may be given a permanent spot on the team and may even be given a second chance at love.
Takes place directly after Reid gets out of prison except Hotch and Morgan are still there