When Hannah Green's dog comes out of the woods carrying a sneaker that contains a partially decomposed foot, she thinks it's the worst thing that could ever happen to her. She is wrong. Hannah and her best friend, Ashley, decide to play detective but find themselves in the middle of a decades-old mystery. What is the strange old woman Mama Bayole hiding in her decrepit farmhouse? Why is the local librarian so determined to prevent them from researching town history? Who is following them around Hopedale, New Hampshire? The girls make a shocking discovery about what has been happening in the woods behind Hannah's house. As they get closer to the truth, things take a dangerous turn, and they play a deadly game of cat-and-mouse that may end up costing them their lives.