criminal minds the last breath

After Emily returned from faking her own death because of doyle, she adopted declan and got back to normal but when a killer from the past comes back and targets the team will the team be able to track him down and stop him before he strikes and one of the team member dies. and as if that's all Emily needs to worry about her mum comes to see her with her with her supposedly dead brother and dad and the team only know about her mum how will they find out and how will they take the news, even worse how will Emily take it.