Talk to girl name Katherine outside. She tells you to give wine to the girl inside the house. Do that, come back outside and you will see other girl going in. You will find the black haired girl in the other room unconscious. Test patience of the guy protecting her by pressing x on her. Doing enough times, he will snap and hit you. Rest is easy. Know that, mannequin puzzle part is little bugged so you will need to reset all recruits from options menu at title screen. Or you can wait until upcoming update.