The Final Chapter of the Niagara Tunnels Mystery. Josh has discovered that his family has a dark secret past, buried for decades in tunnels beneath the most famous waterfalls in the world. But is he in time to solve the riddles of the past and stop the evil deeds of his forebears catching up with him? As the past collides with the present, the future looks grim. Josh and his friends must act fast to unravel the mystery and somehow change the outcome of a plan that was put into place long before he was even born. The thrilling conclusion of the Niagara Tunnels trilogy!