After receiving a mysterious letter, Caleb Ward returns to the quiet town of Merrow Creek and discovers his father’s hidden investigation into secret tunnels beneath the river bend. With the help of Sheriff Nolan Hayes, Caleb uncovers a long buried smuggling operation that cost his father his life years earlier. When the criminals return to reclaim the tunnels, Caleb floods the underground system and finally brings the truth to the surface, allowing the river to carry the past away.