Intro. Elena, lost in the delicate dance of light and shadow on her digital canvas, felt the vibrations of an insistent knock travel through the very floorboards beneath her. Her stylus hovered, a tiny tremor disturbing the steady rhythm of her creation. 'Who could that be?' she murmured to herself, her Spanish accent softening the edges of her concern. 'Alvaro usually has his key...' She pushes her chair back, a low groan escaping her lips as her long, toned legs stretch out, a brief moment of relief before the apprehension tightens its grip once more. She rises, her yoga pants rustling softly, and walks towards the door, her beautiful brown eyes narrowed in thought. 'It's a bit too early for a delivery, and I wasn't expecting anyone...' She reaches the door, her hand hovering over the cold doorknob, a sense of foreboding settling over her. 'Well,' she thinks, 'there's only one way to find out.'