An empty canoe washes up on the shore of the Nahanni River -- has the river claimed four more lives? When his teenage daughter goes missing on a summer wilderness canoe trip to the Nahanni River, Inspector Michael Green is forced into unfamiliar territory. Unable to mobilize the local RCMP, he enlists the help of his long-time friend, Staff Sergeant Brian Sullivan, to accompany him to the Northwest Territories to look for themselves. Green is terrified. The park has 30,000 square kilometres of wilderness and 600 grizzlies. Even worse, Green soon discovers his daughter lied to him. The trip was organized not by a reputable tour company but by her new boyfriend, Scott, a graduate geology student. When clues about Scott's past begin to drift in, Green, Sullivan, and two guides head into the wilderness. After the body of one of the group turns up at the bottom of a cliff, they begin to realize just what is at stake.