Private detective Cassie Dewell (Kylie Bunbury), undersheriff Jenny Hoyt (Katheryn Winnick) and newly appointed sheriff Beau Arlen (Jensen Ackles) maintain order in Helena, Montana, with their unparalleled investigative skills. But when a local backcountry trip led by charismatic outfitter Sunny Barnes (Reba McEntire) goes awry, the trio faces their most formidable mystery yet – in which no camper can be trusted and where danger lurks around every jagged rock and gnarled tree.