Kate is an adventurous and gutsy girl who has returned to her family's cabin at Lake Lure, North Carolina, with her father. Reeling from her parents' recent divorce, Kate is annoyed to see Lily, her dad's editor, working with him on his new book. She bikes off in anger and stumbles across an abandoned cabin tucked behind high walls-and inside, she sees a stockpile of guns and ammunition. Hearing voices and fearing discovery, she flees. Kate meets up with her friends Pete and Seth and convinces them to spy on the cabin with her. They return and discover a trapdoor leading to an underground tunnel. Inside they made a heart-stopping discovery. Behind the Cabin Door is the story of three teens looking for adventure-and finding it. But their discovery may put all of their lives in danger!