While on a road trip to visit her boyfriend in Montana, Danielle Sullivan and her sister Grace are kidnapped by a truck driver on a remote part of the highway, setting off a chain of events that leads private detectives Cody Hoyt and Cassie Dewell to team up with Cody’s estranged wife and ex-cop, Jenny Hoyt, to search for the sisters. But when the investigators discover these are not the only girls who have disappeared in the area, it’s clear they’ve stumbled onto something much bigger than them all.

Forced to form an unlikely team, Cassie and Jenny set out to continue the search for the missing girls. Meanwhile, Danielle, Grace and Jerrie get to work on planning their escape, leading Legarski to struggle with the consequences of his actions as a distracted Ronald deals with a difficult relationship with his mother.

Still on the search for the missing girls, Cassie grows more suspicious of Legarski after a threatening conversation between the two. Meanwhile, Grace manages to make headway on the girls’ quest for freedom. Merilee pleads with Legarski to open up emotionally before it’s too late, and Helen finally confronts Ronald about his increasingly strange behavior.

Unsatisfied with the investigation now that the girls' disappearance has made headlines, Cassie and Jenny take things into their own hands, tapping into their individual strengths to make headway in the case. Meanwhile, Legarski attempts to keep cool, but Ronald takes a different approach to protect himself. Still captive, Danielle and Jerrie tend to Grace, who makes a painful decision in an attempt to save them all.

Jenny and Cassie feel as if they're closing in on Legarski, but they are racing against the clock as he and Ronald are preparing to move the girls. Jerrie makes one last attempt to convince Ronald to let them go. Elsewhere, Cassie visits Merilee to question her about her husband and Ronald aggressively confronts his mother.

Jenny and Cassie officially team up to track down Ronald. Merilee struggles with the fact she didn't truly know her husband. Helen learns about her son's deeds.