Before the finale of season 13, Owen Quinn's character and backstory had never appeared so how am I really supposed to believe it? Quinn was so obsessed with a case that he quits the FBI and yet the BAU didn't know anything about that case until Quinn disappeared? None of this was mentioned in previous episodes. Not only did Quinn's character magically appear but so did a cult of serial killers - the entire context of this story. It is not a believable story. Many episodes of Criminal Minds are linked to each other but not this one - it is completely on an island. #SMH