Wealthy young woman Ruan Qinglan lived alone in a remote mountainside villa. Her parents had gone far away abroad and divorced years ago, leaving only a kind-looking nanny, Zhang Ma, by her side. She had always thought her memory was bad, as food in the refrigerator vanished out of thin air, high-end custom clothing in the wardrobe was replaced with counterfeits, and there were always inexplicable noises at night. It wasn't until the moment of her death that she understood Zhang Ma had hidden a family of five in her basement, eating and drinking for free as uninvited guests occupying the nest, and even dosing her nightly milk with plenty of sleeping pills. Meanwhile, Zhang Ma's son crept onto her bed at night, strangled her to death, forged a suicide note, and seized the entire mountainside villa.