Time in the Davis's house

Melanie turned her wrist, staring at the watch. She tried to find a way to be able to open the lock, but there was no way. In the meantime, she went to her parent's room and tried to see if she would find anything else. 

She heard something beep in the cupboard, and it was very faint. She wondered what the sound was, and when she opened the cupboard door, her mouth slightly fell open. She noticed the surveillance monitor, and it had little windows that showed the footage of some parts of her house—the main door, the kitchen, the backyard and then the basement. 

"Shit," whispered Melanie. "When did they install these things?" 

She had hovered in front of the basement, and her parents would know once they would check it. She had to erase it before they would come.