When cousins Bryson and Emmarie Cousens hear an eerie humming coming from high above them on an old railroad bridge along the heavily wooded Montana-Idaho border, they run for the safety of the bed and breakfast owned by Bryson’s father. But the cousins are curious. When they return to the base of the bridge, they hear the sound again…and this time, they see something on the bridge high above them. A massive bear-like creature walking upright on its back legs! Who or what is this mysterious bridgewalker? Could it be a Bigfoot, the real-life flesh-and-blood monster of all the local legends? The cousins are determined to find out, having no idea how the things they will discover will change their lives, the lives of their families, and even the life of the creature on the bridge.