Private detective Cassie Dewell partners with ex-cop Jenny Hoyt on a search for two sisters who have been kidnapped by a truck driver on a remote highway in Montana. When they discover that these are not the only girls who have disappeared in the area, they must race against the clock to stop the perpetrator before another woman is taken.
Cassie, Jenny and newly appointed sheriff Beau Arlen maintain order in Helena, Montana with their unparalleled investigative skills. But when a local backcountry trip led by charismatic outfitter Sunny Barnes 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.