When eight researchers at Tsalal Station vanish without a trace, Danvers orders a search. After handling a workplace dispute, Navarro tries to convince a skeptical Danvers that the men's disappearance is connected to the murder of a local activist.

As Danvers and Prior learn more about Tsalal – and find an unlikely location for the physical evidence – Captain Connelly threatens to move the case to Anchorage. Later, Navarro and Danvers find a connection between one of the Tsalal men and Annie.

While Hank leads the search for Clark, Prior asks Danvers about the murder-suicide case that drove a wedge between her and Navarro. Then, Navarro and Danvers seek out a local hairdresser for insight on Annie -- which leads to a tip.

As Prior digs into the links between Tsalal and mining company Silver Sky, Navarro rescues Leah from a local protest that has turned violent. At a meeting with Silver Sky exec Kate McKitterick, Danvers is warned not to pursue the case any further.

In the midst of a brutal storm, Danvers and Navarro find themselves stuck at Tsalal with no electricity or means of contact. As the truth about what happened to Annie and the Tsalal men unfolds, Navarro and Danvers each confront the demons from their past.