Johan discovers evidence that suggests his wife, Annika , may have been trying to expose the truth before she disappeared.

"Usijana glava" is the Serbian/Croatian title for the psychological thriller series . In the fifth episode, the mystery surrounding the Polaris VI Antarctic station reaches a breaking point as the survivor's story is scrutinized. ❄️ Episode 5: Key Story Beats

In the present, the search team led by Johan Berg finds more bodies, including those of team members who were thought to be hiding.

Through flashbacks, it is revealed that the current murders are rooted in a tragic incident at the previous station, Polaris V , eight years prior.

Tensions peak as the group's leader, Arthur Wilde, is shown to be increasingly manipulative and desperate to protect his reputation at any cost.

The "Winterers" are forced to confront a dark secret they have been hiding. A fire at the old station was not an accident; it was an attempt to cover up the death of a young scientist named Sarah Jackson .

The episode concludes by setting up the final confrontation, revealing that the "killer" might not be who the survivors claim.