On her way back to her place Sarah remembered that she had left a dress Mrs. Franklin had given her that morning, at the house. So decided to go back and get it.
When she got back to the house, Ben had locked all the doors, but she still had her keys so she let herself inside with them.
She remembered leaving it in one of the rooms downstairs. It was when she was cleaning the room in the morning that Mrs. Franklin came and handed her the dress.
"It makes me look fat," Mrs. Franklin had complained when she handed her the dress.
Sarah was surprised to find the door to the room locked. They rarely locked it. She reached for her bunch of keys and opened it with her spare.
Jane had given her the spare key to almost every room in the house apart from the master's bedroom.
"I can't have you disturbing my beauty sleep because you are looking for the key to a room," Jane had snapped the day she handed Sarah the keys.