Sum up:-
Baptiste clicks on early that Alice has the same nervous habit as Sophie, as confirmed in the video.
Also clicks that the mum has doubts too, think the mum was testing her with the scarf (yellow, like Ollie's) and name of the art teacher.
Alice can't sleep unless she is locked in the shed. Probably going to lead to her death.
Receipt found in bunker which leads back to the butcher. Butchers wife is ex army and knew Henry Reed who is now dead, kept a diary mentioning her then stopped in Iraq.
Baptiste and guide been taken in Iraq (or where ever they are), same man who followed him from the bank was there as well. Daniel recognised by the people who have taken them. Has he joined them?
Dad possibly father baby with Eve, who's dad has dementia.
Turns out the Brigadier knows more than he's letting on and I think is trying to get Alice to go along with it. She is getting uncomfortable about this. Could lead to her death. The way he said she wasn't a little girl anymore, he definitely knows her.
Alice has identified butcher bloke as the abductor but in the present day, Baptiste says finding Daniel Reed will lead them to who took the girls.
Gemma has found a pen from the hotel in Sam's pocket, she'll work out he's having an affair.
Sam lied about getting his scars sorted. Maybe he thinks they should stay there as a reminder of what happened because he feels guilty.