The family was going camping, but in two separate cars. The car the girl was in suddenly drove in a different direction than the car with her parents, and as she looked panicked out the window, she could see her father's reflection shrugging "they'll get there eventually" and soon she could see the other vehicle no more.
Some time later, everyone was all in a small, dark green room, in which someone had carved various phrases on the dusty wooden accents. "The end," and other hints for solving a riddle were seen here and there, and everyone was trying to figure out what was going on, although none could.
Then, there was a flashback, and we saw what happened to the girl when the car drove the wrong way. Somehow, in some trailer that she and the father-like man were in, a murderer appeared. Frightened, she put her head between her knees and put her hands over her neck. The murderer came up to her, and asked her a question ... she quietly responded, and the murderer touched the back of her neck, putting her into a delicate shell. He then walked towards the man. The shell cracked open on one end like a lid, and she slowly edged out through the blood and slime, lying helpless on the floor. The shell healed itself, but again it cracked open and she fell partially out.
Sometime later we find a corpse of the man hidden in a green glade. The girl steps over to him, and kneels over the body ... it's hard to see whether she's crying, or eating him with her beak.
Back to the green room, the girl begins crying, and crying, and remembering the man's slippers.