Build a movie plot around this: Who discovers markings pointing to a specific path? Juno
On her way back from whitewater rafting with her friends Juno (Natalie Mendoza) and Beth (Alex Reid), Sarah (Shauna Macdonald), along with her husband Paul (Oliver Milburn) and their daughter Jessica (Molly Kayll) get involved in a car accident when Paul is distracted. Paul and Jessica are killed, but Sarah survives.One year later, Sarah and her friends Juno, Beth, Sam (MyAnna Buring), Rebecca (Saskia Mulder), and newcomer Holly (Nora-Jane Noone) are reunited at a cabin in the Appalachian Mountains of North Carolina. While spelunking, Juno apologises to Sarah for not being there for her after the accident, but Sarah is distant. As the group moves through a passage, it collapses behind them, trapping them. After a heated discussion, Juno admits she led the group into an unknown cave system instead of the fully explored cave system like they originally planned, and that rescue is impossible because of this. She then tells Sarah that she led them into the unknown cave in the hopes of restoring their relationship, but Sarah rebuffs her.As the group presses forward, they discover climbing equipment from a previous spelunker, and a cave painting that suggests an exit exists. Holly, thinking she sees sunlight, runs ahead, but falls down a hole and breaks her leg. As the others help Holly, Sarah wanders off and observes a pale, humanoid creature (called "crawlers" in the credits) drinking at a pool before it scampers away. Later, the group comes across a den of animal bones, and are suddenly attacked by a crawler. Holly is injured and dragged away by the crawler to her death, Sarah is knocked out by a fall, and Juno accidentally stabs Beth through the neck with a pickaxe after mistaking her for the crawler.Sarah awakens to find herself in a den of human and animal carcasses, and witnesses Holly's body being consumed by a crawler. Juno discovers markings pointing to a specific path through the caves. After regrouping with Sam and Rebecca, and realizing the crawlers' hunting methods, Juno tells them the markings she...