The bedroom curtains rustled as a warm summer breeze blew in through the window. Her mom had left it halfway open before she went out. The summer air felt good. It swirled around the room. It smelled like flowers. It acted like a lullaby.

Felicity shut her eyes, her fingers still wrapped around a fold in her nightshirt. Next to her, her sister said something in her sleep and flopped onto her back. She hated sleeping alone when their parents were out. Normally Felicity liked her room to herself-sharing the same face, same hair, and same birthday with her sister was enough. But tonight she was so happy that she didn’t mind. Besides, they weren’t alone. Deidre was right down the hall, listening to her cassette player and singing along. Her voice was really awful. The two girls giggled about that all the time. But they never said anything to Deidre. She was their babysitter, and she was very bossy. She was also eighteen and starting college. That made her practically a grown-up. And their mom and dad always told them they had to be respectful of grown-ups.

Even Deidre’s bad singing wasn’t enough to keep Felicity awake. Lots of physical activity after lots of sitting around had really worn her out. She drifted off to sleep.

She didn’t see the window slide open the rest of the way. She didn’t see the silhouette of a figure climb inside and cross silently over to the bed, going straight to her sister. Nor did Felicity see the intruder force a damp handkerchief over her face. But she did hear a whimper.

Groggily, Felicity rubbed her eyes and turned over. Still half asleep, she could vaguely make out a human form dressed in a long, loose black hooded sweatshirt. The person was leaning over the other side of the bed. As Felicity watched, her sister’s whimpering stopped, and she went very still.

Felicity’s small body went rigid, and her eyes snapped open. She was suddenly and fully awake. Who was in their house?