Raccoons and Rabbit Holes

What do raccoons and rabbit holes have in common with Harriet Tubman? Jax, Julie, and Ani wouldn't have thought much at all, until the three kids go exploring near an old house in the woods that local legends say is haunted. The kids don't believe in ghosts, and don't expect to find anything scary. But when they meet a raccoon that's acting a little weird, they start to suspect that something strange is about to happen. Especially when a rabbit hole opens up in the roots of a tree big enough for the kids to climb down inside...