An hour ago, Mr. and Mrs. Helen were still enjoying their time on the train, but then Arthur just mysteriously disappeared. Arthur just excused himself to go the bathroom, so Elizabeth was left alone in her seat. An hour later, she started to get worried, as it seems that he has already spent an awful lot of time in the bathroom. She then started to search in every part of the train, but there was really no sign of Arthur. As an investigator who happens to be on board, you have to help Elizabeth find Arthur by finding hidden objects in the train.